Front and Back Colored Polyforms

Let's color front and back of a figure. Using three colors we get 3+3=6 different pieces if the figure is symmetric under reflection and 3*3=9 pieces otherwise. A construction with a complete set of polyforms should meet one of the following conditions. Standard coloring: edges with same color don't touch Strict coloring: edges and corners with same color don't touch Uniform coloring: all touching edges have the same color Connected coloring: areas of same color aren't separated If you would like to combine standard coloring on the front with uniform coloring on the back look at the mobile shown on the left. Other constructions are shown for the following sets: Tetrominoes (3*3+2*9 = 36 pieces) Pentiamonds (2*6+2*9 = 30 pieces) Triabolos (2*6+2*9 = 30 pieces) Tetrahexes (4*6+3*9 = 51 pieces)

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