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