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