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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