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