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