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Write a method indexOf that accepts a value as a parameter and returns the index in the list of the first occurrence of that value, or -1 if the value is not found in the list.

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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