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