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