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