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