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