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