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