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