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