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