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For example,
f(3) = 1/3 + f(2)/3 = 1/3 + 1/6 = 1/2.
f(4) = 1/4 + 2/4 f(3) = 1/4 + 1/2 1/2 = 1/2.
f(5) = 1/5 + 3/5 1/2 = 1/2.
f(6) = 1/6 + 4/6 1/2 = 1/2.
Etc.
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