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