I think subroutines are supposed to be not only a
shortcut when a piece of code is used a lot of times.
First of all, they are linguistic tools to hide things.
In other words, to build abstractions. I think programs
are built on abstractions.
So you could use subroutines even if a piece of code is
used only once.It will increases readability, and maybe you will easier
reuse that piece of code.
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