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