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https://scratch.mit.edu/projects/1131428698/ a ↑^(n) b ≒ f_ω(n) P^(x)_d ≒ f_ω(x) s^(n)(x) ≒ f^n_ω(x) N ≒ f_ω(x) d(x) ≒ f_(ω+1)f_ω(x)
