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Palindrome (169)
Instruction:
The grid is divided into multiple subgrids, separated by thick lines. Place a letter A or B or C in some of the cells. Some cells will remain blank, but blank cells can’t touch each other by a side, even across subgrids. Each row and each column of subgrids form palindromes. A palindrome has at least 2 different letters and reads same from both sides, ignoring the blank cells. Two cells, with different letters, cannot have a thick line between them.