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