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