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