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