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my @letters = ("0","1","2","3","4","5","6","7","8","9","a","b","c","d"
+,"e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u",
+"v","w","x","y","z");
my ($word,$i,$i1,$i2,$i3,$i4,$i5,$i6,$i7);
...
  }
}
close(FILE);

my @letters = ( 0 .. 9, 'a' .. 'z' );

...
  }
}
close FILE;