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