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