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