Place an A, B, or C in each empty cell below so that no three consecutive cells (horizonally, vertically or diagonally) contain a set consisting either of all three different (A, B, and C) letters or all the same letter.

			C
B
	B	A
C	A		B

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From Mensa Puzzle Calendar 2019 by Fraser Simpson, Workman Publishing, New York. Puzzle for December 20.