1. Write a Java program which takes three arguments: first city name second city name third a path to a text file containing comma-separated pairs of connected cities, one pair per line (a pair represents a bi-directional connection: pair "A, B" implies city A is connected to city B, and city B is connected to city A) If the cities specified by the first two arguments are connected then the program prints CONNECTED. Otherwise, it prints NOT CONNECTED. 2. Write unit tests where appropriate.

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