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deleteBack

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Write a method deleteBack that deletes the last value (the value at the back of the list) and returns the deleted value. If the list is empty, your method should throw a NoSuchElementException.

Assume that you are adding this method to the LinkedIntList class as defined below: 

public class LinkedIntList {
    private ListNode front;   // null for an empty list
    ...
}
Partial class: Write code that will become part of an existing class as described. You do not need to write the complete class, just the portion described in the exercise.

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