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