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