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