That `3` can be trivially replaced with a variable in a way that `(i, i, i)` cannot. But still, the refactoring of the iterator into a separate variable is the

That `3` can be trivially replaced with a variable in a way that `(i, i, i)` cannot. But still, the refactoring of the iterator into a separate variable is the key step which reinforces that the same object is being passed 3 times