OBJP5 Exercise 11.21: pairCounts Language/Type: Java Collections Sets and Maps Author: Jeff Prouty (on 2019/09/19) Write a method called pairCounts that accepts a list of strings representing...

OBJP5 Exercise 11.21: pairCounts Language/Type: Java Collections Sets and Maps Author: Jeff Prouty (on 2019/09/19) Write a method called pairCounts that accepts a list of strings representing individual words and counts the number of occurrences of all 2-character sequences of