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