technique of correct posture online puzzle

2x2 - 4 pieces4x3 - 12 pieces6x5 - 30 pieces8x7 - 56 pieces9x8 - 72 pieces10x8 - 80 pieces11x9 - 99 pieces12x10 - 120 pieces13x11 - 143 pieces15x13 - 195 pieces25x21 - 525 pieces Start a new game

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