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