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