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