> **2.** Which of the following should *not* be put in a header file? Why not?
b. Function definitions - Functions should only be defined once, and this allows multiple files to share the same function definition
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> **3.** We saw that writing `#include <file>` instead of `#include "file"` may not work if file is one that we've written. Would there be any problem with writing `$include "file`