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