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