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