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