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