![]() ![]() If you look at line 3, you can see that only one tile is free, the other tile is blocked by two other tiles and so it cannot be selected. It’s a different story with the tiles indicated by the red lines. The tiles indicated by line 2 are also free on one side, so they can be eliminated as well. ![]() If you trace the green line 1 in the picture above, you can see that both of these tiles are free on at least one side, this means these tiles can be combined and eliminated. ![]()
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