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