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