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