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