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