angle, , subtraction, , equation, 2x - 3 = -7, triangle, , sphere, , circle, , square, , digit, a single number symbol (0-9), multiplication, , cube, , oval, , cylinder, , rectangle, , cone, , pyramid, , hexagon, , odd, number (3,5,7), pentagon, , heptagon, , even, number (4,6,8), addition, , fraction, , octagon, , division, , length, l stands for ..., height, h stands for ..., trapezoid, , root, square.

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