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