Period of first differences by jonathan camacho

IaS]n/{s/(v:40<{.v~-\v:}%b:1 f:0 i:{f}{i)i:b A#b i<b,i/)*b,<A#={i P,0 f:}{}Fi}%}/

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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