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