"use warnings", Luke!

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# 3.2. "use warnings", Luke!

There is another pragma which is called and typed as `use warnings;`, that causes the interpreter to emit many warnings to the command window in case you're doing wrong things (like using `undef` in an expression). It is also very useful to declare it at the beginning of the program, in addition to `use strict;`. So, from now on, our programs will include it as well.

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