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