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Introduction to Kafka QueueStart Your Free Data Science Course
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Syntax of Kafka Queue
As such, there is no exact syntax exist for Kafka queues. To work with the Kafka queues, we need to know the complete architecture of the Kafka streaming solution. Similarly, we need to also know how the data is flowing in the Kafka environment. In Kafka queues, we are using it with the number of consumers like the Kafka consumer group. As per the requirement or need, we need to define the queue configuration of the Kafka environment. As per the defined architecture, we need to set the number queue configuration and define it as per the requirement. In Kafka, it will support both the message queue as well as the publish & subscribe technique (It will depend on the architecture and requirement).
How Kafka Queue Works?Given below are the lists of properties that would be helpful to tune the queue in the Kafka environment.
1. Property name: queued.max.requests
The default value for this property: 500.
2. Property name: controller.message.queue.size
The default value for this property: 10.
Explanation: The chúng tôi property will help to define the buffer size value. The same buffer size value pointing to the controller-to-broker channels.
3. Property name: queued.max.message.chunks
The default value for this property: 10.
Explanation: The queued.max.message.chunks property will help to define the maximum number of messages group, or chunks will be buffered for the consumption. As per the requirement, we can define the value of this. The single chunk will be able to fetch the data as per the fetch.message.max.bytes.
4. Property name: queue.buffering.max.ms
The default value for this property: 5000.
Explanation: This is the time value we are defining for the chúng tôi property. It would define the time to hold the buffer data when it will use the async mode. Let’s take an example; if we set the value 200, then it will try to do the batch together at the 200 Ms of the messages or the data to send at a single point. So thus, it will be able to improve the throughput. But once the throughput increases, the latency of the additional messages will increase due to the buffering.
5. Property name: queue.buffering.max.messages
The default value for this property: 10000.
Explanation: It will help to define the number of unsent messages. It will be queued up to the producer. It will happen when we are using async mode. It might happen either the Kafka producer will be blocked, or the data will be dropped.
6. Property name: queue.enqueue.timeout.ms
The default value for this property: -1.
Explanation: It will define the amount of that will be hold before dropping the messages. When we are running in the async mode, then the buffer will reach to queue. If we will set the value as the “0”, it will be queued immediately. In other words, it will drop if the queue is full. The producer will send the call to never block. If we set the value as “-1”, then the producer will block, and it will not be able to drop the request.
7. Property name: batch.num.messages
The default value for this property: 200.
Explanation: The number of messages to send in one batch when using async mode. The producer will wait until either this number of messages is ready to send or chúng tôi is reached when we are using the async mode then the batch.num.messages property will help to define the number of messages that will send in a single batch. The Kafka producer will wait until the number of messages is ready to send. In other words, it will also wait for the value which is defined under chúng tôi will be reached.
Example of Kafka QueueGiven below is the example of Kafka Queue:
As such, there is a specific command to work with the Kafka queue. It is just a technique that we need to understand and make the Kafka broker’s necessary changes. As per the above configuration property that we have shared.
ConclusionWe have seen the uncut concept of the “Kafka queue” with the proper explanation. For the Kafka broker, we need to tune the Kafka queue properties. When multiple consumers want to access a single topic, only a queue will come in a picture.
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How Does Isnan() Function Works In Javascript?
Introduction to isNaN() JavaScript
In this article, we will learn about isNaN() JavaScript. We will try to split the function isNaN() word by word and analyze the meaning of the function. is and NaN is both 2 separate words. NaN abbreviation is Not a Number. Now if we include any helping verb in front of any word, give a question right. Here also, isNaN means checks given value is a Number or Not. isNaN() checks whether the value passed to it is true or false.
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How does the isNaN() function work in JavaScript?
isNaN() function always checks whether the value is a Number or Not a Number.
isNaN() returns the Boolean value as output.
Returned Boolean values are true or false.
If the given value is a string, it returns true; if the given value is a number, it returns false.
isNaN(value);value: Pass the required value to check whether it is a number or not.
Example: There is a situation if we want to add or subtract numbers. Let’s suppose the numbers we are getting are from 3rd party clients. Are we directly add or subtract those values? No, because We don’t know what those values are, whether numbers or strings. So, we first check whether it is a number or not by using the isNaN() function. If the number is in string form, we simply par the number. Later we will add or subtract.
Examples to Implement in isNaN() JavaScriptBelow is the example of implementing in isNaN() JavaScript:
Example #1Checking whether passing Strings are numbers or not
Code:
function checkStringsNumberOrNot() { var a=”Amardeep”; var b=”123″; var c=’25/12/2023′; var d=”123Param”; var e=”Hi989″; var f=”*&^%”; var g=123+”Hello”; } checkStringsNumberOrNot();
Output:
Explanation of the above code: Amardeep is not a number, so the function returns true. 123 is a number, so the function returns false. 25/12/2023 is not a number but a date, so the function returns true. 123Param is not a number, so the function returns true. Hi989 is not a number, so the function returns true. 8&^% is not a number, so the function returns true. 123Hello is not a number, so the function returns true. (123+” String”=String so becomes 123Hello).
Example #2Checking whether passing integers are numbers or not
Code:
function checkIntegersNumberOrNot() { var a=”989″; var b=23; var c=-25; var d=-5.21; var e=’+28.67F’; var f=”87.23L”; var g=’0′; } checkIntegersNumberOrNot();
Explanation of the above code: 989 is a number, so the function returns false. 23 is a number, so the function returns false. -25 is a number, so the function returns false. -5.21 is a number, so the function returns false. +28.67F is not a number, so the function returns true. 23L is not a number, so the function returns true. 0 is a number, so the function returns
Note: Whereas in Java, suffixes F and L indicate float and long numbers, respectively, JavaScript doesn’t.
Example #3Checking whether passing predefined JavaScript values are numbers or not
Code:
function checkPredefinedValuesNumberOrNot() { var a=”true”; var b=”false”; var c=”undefined”; var d=”null”; var e=0/0; var f=NaN; var g=”NaN”; } checkPredefinedValuesNumberOrNot();
Output:
Explanation of the above code: true is not a number, so the function returns true. false is not a number, so the function returns true. Undefined is not a number, so the function returns true. null is not a number, so the function returns true. NaN(0/0) is not a number, so the function returns true. NaN without quotes is not a number, so the function returns true. NaN with quotes is not a number, so the function returns true.
Example #4Its checks passed value is NaN, and its type is number. It is an updated version of the isNaN() direct-using function. It also returns true or false based on the value provided to it.
Code:
function checkValuesNumberOrNot() { var a=10; var b=”false”; var c=0/0; var d=-21.7; var e=Number.NaN } checkValuesNumberOrNot();
Output:
Explanation of the above code: 10 is a number, so the function returns false. false is a number, so the function returns false. NaN (0/0) is not a number, so the function returns true. -21.7 is a number, so the function returns false. NaN (Number.NaN) is not a number, so the function returns true.
Note:
Number.isNaN() returns the false and true output as false only because it considers false as 0 and true as 1 here.
Function isNaN continuously checks whether the value inside the function is a number or not, whether in single quotes, double quotes, or no quotes.
ConclusionisNaN() function is used to figure out whether a given value is a number or not. If the given value is a number, then return false otherwise, return true.
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Learn How Does The Numpy.clip() Function Works?
Introduction to Numpy.clip() in Python
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In simpler terms for an interval specified (for instance : [0, 1]) the values that are greater than 1 shall deem to become one and the ones smaller than zero shall deem to become zero. In comparison to using the function min() and max() and checking their comparatives by maximum(), the clip() serves a much quicker and more comprehensive solution when compared to running the while loop.
Syntax and Parameters for Numpy clip()Following syntax is used structurally to construct code in python language:
numpy.clip (arr, a _min, a_max , out = None)Following are the parameters that are used in the syntax for numpy.clip() function in Python:
Parameters Description
array ( here arr) (alternatively, can be specified within the code itself)
(Scalar value, keyword: “arraylike” or keyword: “None”) If NONE is specified then the lowest element of the array would be considered to be the smallest element in the array entered. It has to be noted that the parameter NONE should not be specified for both a_min and a_max. If either one of the parameters is kept as ARRAYLIKE it results in 3 different arrays being broadcast.
(Scalar value, keyword: “arraylike” or keyword: “None”) The highest value to be put for the array limit is the upper extent with which the array elements have been checked if they are larger than the lower limit.
Return Value when running through Numpy.clip()This Numpy.clip() function returns a two-dimensional array that has been specialized from the string of elements that have been presented in the array.
numpy.clip ( arr,a_ min, a _ max, out = None )Returns: Here the lower values are replaced by a_min values and higher limits are replaced by a_max
Example of Numpy.clip()Code:
# To demonstrate the usage of the Numpy clip () function in python language # calling the Numpy by importing it to perform the clip function import numpy as N1 Ar_array = [10 , 20 , 30 , 40 , 50 , 60 , 70 , 80 ] print ("Please enter the elements for the array :- ", Ar_array ) Output_array = N1.clip(Ar_array, a_min = 20 , a_max = 60 ) print ("The new clipped array will be : " ) print Output_arrayThe output of the above-given code is as follows:
How does the Numpy.clip() function work?
It is found in a lot of data concerning issues and algorithmic functionalities (for instance the Proximal Policy Optimization or PPO used in algorithms of reinforcement learning) where there is a need to limit the elements under an upper or lower value or both.
The numpy clip serves the purpose of delivering a pre-built functionality of limiting the values.
The following diagram pictographically displays how the clip function actually works and gives an insight into its mechanism of limiting
Fig: The image here displays how the default values using index numbers are identified and put under the clipped limit values
The system first analyses the values present in the array entered by the user
It then checks the limits for both the upper value and lower value
It then compares with each element if it does not confer to the limits and checks for their index with respect to the initial array entered
It changes the defaulting dex number to the upper limits and lowers limits specified.
Finally, it changes the values with the replaced limited values and makes a new array that suffices the need specified for the function to be performed by the user
ConclusionThe numpy clip function serves as one argument/liner solution to give clipped arguments for arrays which are frequently required by various algorithms which in a wat reduce the computational time needed to run code. It also decreases the verbosity of the code making it better for large data analysis.
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How Delegate Works In Kotlin
Introduction to Kotlin delegate
The kotlin delegate is one of the design patterns that can be used to implement the application concepts like inheritance with the help of keywords like “by” or delegation methodology it’s used to derive the class to public access it implements with the other concepts like interface that allowed to call the specific object delegate used other keywords like public, default also the lazy values gets computed only in the parent classes also created anonymous objects without creating a class using the interfaces, properties and other default standard libraries other delegation types like explicit it supports oops and other delegation objects.
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Syntax of Kotlin delegateIn kotlin language, we used many default keywords, variables, and other built-in functions. Like that delegate is one of the concepts and the design pattern which helps to implement the application. With the help of “By” keyword we can achieve the delegation in the kotlin language.
interface first{ ---functions declaration— } class classname() : first{ ---override the function declaration with name which is used by the interface— } class name2(variable: interface name(first)) : first by variable fun main() { --some logic codes depends on the requirement— }The above code is the basic syntax for utilizing the kotlin delegation in the application.
How does delegate work in Kotlin?The kotlin language has many design patterns like java and other languages. Each design pattern has implemented its own logic and reduces the code complexity easily track the codes with other new users. Like that delegation is one of the design patterns and it is used to replace or on behalf of the other values the object request is received by one variable and instead of that variable will use another variable with the same logic and output results.
So that it is one of the easiest methods for providing support for both class and other properties that can be delegated to the pre-built in classes and methods. Generally, the kotlin delegation is achieved using the “by” keyword that delegates the kotlin functionality from the other interfaces with other methods. Each method has a separate behavior and its attribute.
In delegates, it is especially used to inherit from the particular class that may be the hierarchy one, and the same will be shared with the interface and decorates both internal and external objects of the original type. This can be achieved using the public APIs that delegate with the properties which are either set and get calls handling by using the object.
Examples of Kotlin delegateGiven below are examples of Kotlin delegates.
Example #1Code:
interface first { fun demo() fun demo1() } class example(val y: String) : first { override fun demo() { print(y) } override fun demo1() { println(y) } } class example1(f: first) : first by f { override fun demo() { print("Welcome To My Domain its the first example that related to the kotlin delegation") } } data class examples(val user: String, val ID: Int, val city: String) fun main() { val b = example("nHave a Nice Day users, Please try again!") example1(b).demo() example1(b).demo1() val inp1 = listOf( examples("Siva", 1, "your location is chennai"), examples("Raman", 2, "your location is tiruppur"), examples("Siva Raman", 3, "your location is mumbai"), examples("Arun", 4, "your location is andhra"), examples("Kumar", 5, "your location is jammu"), examples("Arun Kumar", 6, "your location is kahmir"), examples("Madhavan", 7, "your location is madurai"), examples("Nayar",8, "your location is karnataka"), examples("Madhavan Nayar", 9, "your location is delhi"), examples("Rajan", 10, "your location is west bengal"), ) val inp2 = inp1 .filter { it.user.startsWith("M") } .maxByOrNull{ chúng tôi } println(inp2) println("Your input user lists are : ${inp2?.user}" ) println("The user IDs are shown: ${inp2?.ID}" ) println("city: ${inp2?.city}" ) println("Thank you users for spenting the time with our application kindly try and spent more with our application its useful for your knowledge, $inp1") }In the first example, we used delegates design pattern with a collection list to perform the datas in array operations.
Example #2Code:
import kotlin.properties.Delegates class Employee { } } class EmployeeDetails { var Id: Int = 0 var oldID: Int by this::Id } val eg = fun(a: Int, b: Int): Int = a + b val eg1 = fun(a: Int, b: Int): Int { val multipl = a * b return multipl } val eg2 = fun(a: Int, b: Int): Int = a - b val addition = a + b demo(addition) } val subtraction = a - b demo(subtraction) } fun main() { println("Welcome To My Domain its the second example that related to the kotlin delegates") println("Thank You users have a nice day") val Employee = Employee() Employee.EmployeeName = "first" Employee.EmployeeName = "second" val EmployeeDetails = EmployeeDetails() EmployeeDetails.oldID = 41 println(EmployeeDetails.Id) val sum = eg(23,34) val multipl = eg1(34,23) val minus = eg2(34,23) println("Thank you users the sum of two numbers is: $sum") println("Thank you users the multiply of two numbers is: $multipl") println("Thank you users the subtraction of two numbers is: $minus") val new = { println("Thank you for using the kotlin delegates concepts in the application!")} new() new.invoke() val new1 = arrayOf(27,71,93) new1.forEach { println(it*it) } }Output:
Example #3Code:
class Third { var var1: Int = 13 var var2: Int by this::var1 } fun main() { val Third = Third() Third.var2 = 42 println("Welcome To My Domain its the third example taht related to the kotlin delegates") println(Third.var1) }Output:
In the final example, we used the delegates pattern with the help of by keyword.
ConclusionIn conclusion, kotlin uses many concepts like interface, classes, anonymous classes here in the delegate pattern without class we can create anonymous objects. The kotlin interface delegation should must know that when will be used and how to configure it on the application logic via code without affecting existing areas.
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How Pyspark To_Date Works In Pyspark?
Introduction to PySpark to_Date
PySpark To_Date is a function in PySpark that is used to convert the String into Date Format in PySpark data model. This to_Date function is used to format a string type column in PySpark into the Date Type column. This is an important and most commonly used method in PySpark as the conversion of date makes the data model easy for data analysis that is based on date format. This to_Date method takes up the column value as the input function and the pattern of the date is then decided as the second argument which converts the date to the first argument. The converted column is of the type pyspark.sql.types.DateType .
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In this article, we will try to analyze the various ways of using the PYSPARK To_Date operation PySpark.
Syntax:
from pyspark.sql.functions import * df2 = df1.select(to_date(df1.timestamp).alias('to_Date')) df.show()The import function in PySpark is used to import the function needed for conversion.
Df1:- The data frame to be used for conversion
To_date:- The to date function taking the column value as the input parameter with alias value as the new column name.
Df2:- The new data frame selected after conversion.
Screenshot:
Working of To_Date in PySparkLet’s check the creation and working of PySpark To_Date with some coding examples.
ExamplesLet’s start by creating a simple data frame in PySpark.
df1=spark.createDataFrame( data = [ ("1","Arpit","2023-07-24 12:01:19.000"),("2","Anand","2023-07-22 13:02:20.000"),("3","Mike","2023-07-25 03:03:13.001")], schema=["id","Name","timestamp"]) df1.printSchema()Output:
df1.show()Screenshot:
Now we will try to convert the timestamp column using the to_date function in the data frame.
We will start by importing the required functions from it.
from pyspark.sql.functions import *This will import the necessary function out of it that will be used for conversion.
df1.select(to_date(df1.timestamp).alias('to_Date'))We will start by selecting the column value that needs to be converted into date column value. Here the df1.timestamp function will be used for conversion. This will return a new data frame with the alias value used.
Screenshot:
df1.select(to_date(df1.timestamp).alias('to_Date')).collect()We will try to collect the data frame and check the converted date column.
[Row(to_Date=datetime.date(2023, 7, 24)), Row(to_Date=datetime.date(2023, 7, 22)), Row(to_Date=datetime.date(2023, 7, 25))] df2 = df1.select(to_date(df1.timestamp).alias('to_Date'))This will convert the column value to date function and the result is stored in the new data frame. which can be further used for data analysis.
df2.show()Let us try to check this with one more example giving the format of the date before conversion.
df = spark.createDataFrame([('2023-07-19 11:30:00',)], ['date'])This is used for creation of Date frame that has a column value as a date which we will use for conversion in which we can pass the format that can be used for conversion purposes.
df.select(to_date(df.date, 'yyyy-MM-dd HH:mm:ss').alias('date')).collect()This converts the given format into To_Date and collected as result.
Screenshot:
This to date function can also be used with PySpark SQL function using the to_Date function in the PySpark. We just need to pass this function and the conversion is done.
spark.sql("select to_date('03-02-2023','MM-dd-yyyy') converted_date").show()This is the converted date used that can be used and this gives up the idea of how this to_date function can be used using the chúng tôi function.
Screenshot:
spark.sql("select to_date('2023-04-03','yyyy-dd-MM') converted_date").show()Screenshot:
These are some of the Examples of PySpark to_Date in PySpark.
Note:
1. It is used to convert the string function into Date.
2. It takes the format as an argument provided.
3. It accurately considers the date of data by which it changes up that is used precisely for data analysis.
4. It takes date frame column as a parameter for conversion.
ConclusionFrom the above article, we saw the working of TO_DATE in PySpark. From various example and classification, we tried to understand how this TO_DATE FUNCTION ARE USED in PySpark and what are is used in the programming level. The various methods used showed how it eases the pattern for data analysis and a cost-efficient model for the same.
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How Switch Component Works In React
Introduction to React-Native Switch
React-Native Switch is a component controlled by Boolean which assigns its value to true or false. To update the value prop in respect of the component to reflect user actions, on Value Change callback method of React-Native Switch is used. If there is no update in the valueprop the component won’t be able to give the expected result for user action instead it will continuously provide the supplied value. The props of the Switch are disabled, trackColor, ios_backgroundColor, onValueChange, testID, thumbColor, tintColor, value. The major used props of the Switch are on Value Change (invoked with the change in switch value) and value (switchvalue).
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import { Switch} from 'react-native' <Switch onValueChange={ (value) =? this.setState({ toggled: value })} value={ this.state.toggled }Syntax to use Render in the Switch:
How Switch Component works in React-Native?The working of switch component in react native is defined in the following steps:
Step 1: For logic, HomeContainer component is used, and in the code below presentational component is created with the help of new file SwitchExample.js.
Step 2: To toggle switch items in SwitchExamplecomponent, the value has been passed from the state and functions. For updating the state Toggle functions are used. Switch component takes two props. When a user presses the switch, the onValueChange prop will trigger the toggle functions. To the state of the HomeContainer component, the value prop is bounded. If Switch is pressed, the state will be updated and one can check the values in the console, before that values bounded to default.
Logic and Presentation of Switch in the ApplicationGiven below is the coding for logic and presentation of switch in the application:
Code:
import React, { Component } from 'react' import {StyleSheet, Switch, View, Text} from 'react-native' export default class SwitchExample extends Component { state = { switchValue: false }; render() { return ( <Switch value={this.state.switchValue} onValueChange ); } } const styles = StyleSheet.create({ container:{ flex:1, alignItems: 'center', justifyContent: 'center', backgroundColor: '#96f2ca', }, textStyle:{ margin: 25, fontSize: 24, fontWeight: 'bold', textAlign: 'center', color: '#3a4a35' } })Output:
Examples of React Native SwitchGiven below are the examples:
Example #1React Native Switch.
In the example below, initially the Switch value is set to “FALSE” and display TEXT with “OFF”. When there is change of the value of Switch to “TRUE” by calling onValueChange the component of TEXT will reset to“ON”.
import React from 'react'; import { Switch ,Text ,View , StyleSheet } from 'react-native'; export default class App extends React.Component{ state = { switchValue: false }; }; render() { return ( <Switch style={{ marginTop: 31 }} onValueChange={this.toggleSwitch} value={this.state.switchValue} ); } } const styles = StyleSheet.create({ container: { flex: 1, justifyContent: 'center', alignItems: 'center', backgroundColor: '#edb5ff', }, });Output:
Example #2Using Switch Case Statement in React Native.
Code:
import React, { Component } from 'react'; import { Platform, StyleSheet, View, TextInput, TouchableOpacity, Alert, Text } from 'react-native'; export default class App extends Component { constructor(){ super(); this.state={ TextInput_Data : '' } } case '1': this.ONE(); break; case '2': this.TWO(); break; case '3': this.THREE(); break; case '4': this.FOUR(); break; default: Alert.alert("NUMBER NOT FOUND"); } } Alert.alert("ONE"); Alert.alert("TWO"); } Alert.alert("THREE"); } Alert.alert("FOUR"); } render() { return ( <TextInput placeholder="Enter Value Here" keyboardType = {"numeric"} ); } } const styles = StyleSheet.create({ MainContainer: { flex: 1, paddingTop: (Platform.OS) === 'ios' ?20 : 0, justifyContent: 'center', alignItems: 'center', backgroundColor: '#f6ffa6', marginBottom: 20 }, textInputStyle: { height: 40, width: '90%', textAlign: 'center', borderWidth: 1, borderColor:'#033ea3', borderRadius: 8, marginBottom:15 }, button: { width: '80%', padding: 8, backgroundColor:'#7a53e6', borderRadius:5, justifyContent: 'center', alignItems:'center' }, TextStyle:{ color:'#ffffff', textAlign:'center', } });Output:
Example #3Customisable Switch Component for React Native.
import React, { Component } from 'react'; import { StyleSheet ,Text ,View , Switch , Alert } from 'react-native'; export default class App extends Component { constructor() { super(); this.state = { SwitchOnValueHolder: false } } SwitchOnValueHolder: value }) if (value == true) { Alert.alert("You have truned ON the Switch."); } else { Alert.alert("You have turned OFF the Switch."); } } render() { return ( <Switch ); } } const styles = StyleSheet.create({ container: { flex: 1, justifyContent: 'center', alignItems: 'center', backgroundColor: '#afff63', }, text: { fontSize: 19, color: '#000000', }, });Output:
Below image shows the window that will appear when Switch is turned ON and Switch is turned OFF respectively.
When Switch is in ONstate:
When Switch is in OFFstate:
ConclusionHere we got to know that the Switch value can be set to ON when the value prop is set to TRUE and the Switch value can be set to OFF when the valueprop is set to FALSE which is also the default value of valueprop. We have also seen the working of the Switch in React-Native from creating a file then to logic then finally to presentation. We also got to know about how to develop a simple switch, developing switch using a switch case statement and also developing a customizable switch. In React-Native switch can be developed very easily and very efficiently.
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