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As one starts to tackle larger problems, one finds that
often there are common tasks that get performed over and
over again, and so the code to do these tasks
gets repeated over and over again.
This can make programs long, and also harder to maintain -
if one wanted to change slightly one aspect of a particular
task, this might entail many changes throughout you program.
In such cases the use of a subroutine or a function
can help immensely.