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