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  1. or download this
    sub iterate {
  my $code = shift;
...
  return $back;
}
  2. or download this
    &iterate(\&attach,@param);
  3. or download this
    my $rep = Module->new();
  4. or download this
    &iterate($rep->attach(),@param);      # ?? No
&iterate(\$rep->attach(),@param);     # ?? Noooo
&iterate(\{$rep->attach()},@param);   # ?? Hehe...