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