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