Please note that plastic colors vary.
Two squares form a rectangle. Two triangles (one half of the square each) are attached to the squares but only to the longer side(s) of the rectangle. 9 pieces represent a full set. You need 2 more squares and 2 more triangles to fill the 5x6 tray completely. Those 2 squares are placed in two diagonal corners, so ther are two empty triangles - somewhere....
4 solutions.
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