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