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