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