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