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