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