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