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