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