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