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