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