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