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  1. or download this
    #I made this change first...
    -  1 while(readline($data[$i]->{FH}));
    +  while(readline($data[$i]->{FH})){
    +      1;
    +  };
    
  2. or download this
    main::(./overlay.pl:5): die("usage: overlay file1 file2\n") unless sca
    +lar @ARGV
    == 2;
    ...
    main::(./overlay.pl:13):          seek($data[$i]->{FH}, 0, 0);
      DB<1> n
    main::(./overlay.pl:7): for(my $i=0; $i < scalar @ARGV; $i++){
    
  3. or download this
    ...
    main::(overlay.pl:9):     while(readline($data[$i]->{FH})){
    ...
    main::(overlay.pl:10):        1;
      DB<1> n
    ...