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