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