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