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