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Merge branch 'master' of https://github.com/paulcottin/nineSquarePuzzle

Conflicts:
	nineSquarePuzzle/src/nineSquarePuzzle/Board.java
	nineSquarePuzzle/src/nineSquarePuzzle/Piece.java
	nineSquarePuzzle/src/nineSquarePuzzle/Pool.java