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