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 use strict;
use warnings;
use diagnostics;
...
    }
}
__END__

 loop 2
2 4 6 8 10 12 14 16 18 20
 loop 3

 loop 4

warn " loop $loop i $i \n";

 loop 2 i 1
2 4 6 8 10 12 14 16 18 20
...

 loop 4 i 11

2 4 6 8 10 12 14 16 18 20
3 6 9 12 15 18 21 24 27 30
4 8 12 16 20 24 28 32 36 40