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