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