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Fascinating. From page 8, §11, in the section on "Unterpläne", it looks also as if it used a kind of function calls and subroutines. "Plan" seems to mean "program", so "Unterplan" is literally subprogram, and it had a facility to automatically return to the point where it the subprogram was called.

>While working on his doctoral dissertation, Zuse developed the first known formal system of algorithm notation[7] capable of handling branches and loops.[8][9]

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