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