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