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