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