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