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