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