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