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file 1
------
...
d 0
e 0
f 0

file3
-----
...
d 1
e 3
f 0

   open FIRST,"file1" or die "Can't open file1: $!\n";
   open LAST,"file2" or die "Can't open file2: $!\n";
...
   close FIRST;
   close LAST;
   close NEW;