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