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