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