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BJP5 Exercise 11.12: contains3

Language/Type: Java Collections Sets and Maps
Author: Marty Stepp (on 2019/09/19)

Write a method contains3 that accepts a List of strings as a parameter and returns true if any single string occurs at least 3 times in the list, and false otherwise. Use a map as auxiliary storage.

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This is a method problem. Write a Java method as described. Do not write a complete program or class; just the method(s) above.

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