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