Nickles and Pennies

Appeared in Volume 9/3, August 1996

10 spaces and 8 coins: 4 nickles (X) and 4 pennies (Y), in the following order.

	__  __  X  X  X  X  Y  Y  Y  Y

Each move consists of moving two adjacent coins to the blank spaces.

Challenge: In four moves, change the coins to:

	X  Y  X  Y  X  Y  X  Y  __  __