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foreach ( 0..@#array ) {...

foreach ( @array ) {.....

foreach ( @first_array ) {
     foreach ( @second_array ) {
          print "$_\n";
     }
}

foreach my $outter_element ( @outter_array ) {
     foreach ( @inner_array ) {
          print "$outter_element, $_\n";
     }
}

foreach ( @outter_array ) {
     my $outter_element = $_;
...
          print "$outter_element, $_\n";
     }
}

print "$_\n" foreach @array;

foreach ( @array ) {
     print "$_\n";
}