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