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