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