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