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Palindrome^2 (170)
Instruction:
Place a letter A or B or C in some of the cells. Some cells will remain blank, but blank cells do not share an edge. Each row and each column of the grid, and each row and each column of the thickly outlined square regions within the grid, form palindromes. A palindrome has at least 2 different letters and reads the same from both sides, ignoring the blank cells.