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  1. or download this
    @arr = (1 .. 20);
foreach $i ( 0 .. $#arr ) {
...
        print "$i\n";
    }
}
  2. or download this
    @arr = (1 .. 20);
foreach $i ( 0 .. $#arr ) {
...
        print "$i\n";
    }
}
  3. or download this
    @arr = (1 .. 20);
foreach $i ( 0 .. $#arr ) {
...
        print "$i\n";
    }
}