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