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