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