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