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symmetry odd numbers spheres the only crossnumber money integers crossnumber tangents coins elections crosswords circles balancing digital clocks differentiation tournaments christmas geometry triangle numbers even numbers numbers logic sequences routes arrows unit fractions chess integration functions shape books median menace binary pentagons quadratics planes games area dominos scales lines remainders number perimeter wordplay dates time chalkdust crossnumber irreducible numbers hexagons digital products axes cards palindromes sets prime numbers digits bases mean expansions shapes rugby surds people maths consecutive integers grids parabolas multiples polynomials doubling graphs ave star numbers factors perfect numbers factorials advent geometric means taxicab geometry coordinates probability trigonometry angles squares sport pascal's triangle square numbers matrices dodecagons indices cubics clocks addition means probabilty regular shapes tiling 2d shapes multiplication 3d shapes volume fractions colouring algebra dice triangles products square roots partitions decahedra consecutive numbers rectangles ellipses averages calculus cube numbers floors percentages speed division range cryptic crossnumbers geometric mean complex numbers combinatorics sums folding tube maps sum to infinity polygons quadrilaterals chocolate determinants gerrymandering albgebra crossnumbers cryptic clues proportion