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