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