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