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