Sample output from the program in Listing One.

ping	PONG	ping	ping	PONG	ping	ping	ping	PONG	ping
ping	PONG	ping	ping	ping	PONG	ping	ping	PONG	ping
ping	ping	PONG	ping	ping	ping	PONG	ping	ping	PONG
ping	ping	ping	PONG	ping	ping	ping	PONG	ping	ping
PONG	ping	ping	ping	PONG	ping	ping	ping	PONG	ping
ping	ping	PONG	ping	ping	PONG	ping	ping	ping	PONG	...