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