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