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  1. or download this
    >perl -wMstrict -le
"my @text = qw/A B C D E F G H I J/;
...
   }
"
F is at index 5
  2. or download this
    >perl -wMstrict -le
"my @text = ('A' .. 'J');
...
   }
"
F is at index 5
  3. or download this
    >perl -wMstrict -le
"my @text = qw/A B C D E F G H F I J/;
...
 print qq{these indices have an 'F': @F_in_it};
"
these indices have an 'F': 5 8