$ /usr/local/blead/bin/perl5.9.3 many.plx 
Locations after seeking ORIG to 256: 
    ORIG 256  DUPE not valid
Locations after reading 8 bytes from ORIG: 
    ORIG 264  DUPE not valid
ORIG read these bytes: 0 64 0 0 0 65 0 0
Locations immediately after duping: 
    ORIG 264  DUPE 264
Locations after seeking DUPE to 256: 
    ORIG 264  DUPE 256
Locations after seeking ORIG to 120: 
    ORIG 120  DUPE 256
Locations after reading 20 bytes from ORIG: 
    ORIG 140  DUPE 256
Locations after reading 8 bytes from DUPE: 
    ORIG 140  DUPE 264
DUPE read these bytes: 4 30 0 0 4 31 0 0
$