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