4x12 - 48 pieces 4x13 - 52 pieces 5x14 - 70 pieces 5x15 - 75 pieces 5x16 - 80 pieces 6x17 - 102 pieces 6x18 - 108 pieces 6x19 - 114 pieces 7x20 - 140 pieces 7x21 - 147 pieces 7x22 - 154 pieces 8x23 - 184 pieces 8x24 - 192 pieces 9x25 - 225 pieces 9x26 - 234 pieces 9x27 - 243 pieces 10x28 - 280 pieces 10x29 - 290 pieces 10x30 - 300 pieces 11x31 - 341 pieces 11x32 - 352 pieces 11x33 - 363 pieces 12x34 - 408 pieces 12x35 - 420 pieces 13x36 - 468 pieces 13x37 - 481 pieces 13x38 - 494 pieces 14x39 - 546 pieces 14x40 - 560 pieces
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By arranging these puzzles, you show us that they are worth showing to more visitors. Until they become more popular, they are partially hidden.
About human organs systems including nervous system, endocrine system, circulatory system, movement system, skeletal system, digestive system, excretory and respiratory.
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