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