Three Tiling Puzzles

Here are three tilings for the 6x6 square. The tiling pieces are made of sub squares connected by edges. A set of 6 identical pieces composed of 6 sub squares and a set of 4 identical pieces composed of 9 sub squares are provided. The two sets can each be arranged to tile the 6x6 square. The sets were chosen so that if one takes two of the 9 piece tiles and three of the 6 piece tiles, this set of five pieces also tiles the 6x6 square. Openscad code is included.