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