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