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