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int product (int x, int y) {
  return x * y;
...
    related to prodID in the given company
  */
}

sub foo {
  die "foo() needs at least one argument" if !@_;
...
  $z ||= $x * $y;
  # ...
}

sub foo (
  my($x) :req,
...
) {
  # ...
}