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Can anyone help ? I can't understand this recursion function

Revision en4, by Spam_498002, 2021-10-15 16:27:14
Tags help, blog, problem solving

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  Rev. Lang. By When Δ Comment
en4 English Spam_498002 2021-10-15 16:27:14 469
en3 English Spam_498002 2021-10-15 16:25:53 20 Tiny change: 'em/B\n\n\n\n==================#include<b' -> 'em/B\n\n\n#include<b'
en2 English Spam_498002 2021-10-15 16:24:55 70 (published)
en1 English Spam_498002 2021-10-15 16:23:17 540 Initial revision (saved to drafts)