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#!/usr/bin/perl
use warnings;
...
file4 d41d8cd98f00b204e9800998ecf8427e
file5 5bb062356cddb5d2c0ef41eb2660cb06
file6 d617c2deabd27ff86ca9825b2e7578d4

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d617c2deabd27ff86ca9825b2e7578d4
   file6
...
file5 is the same as
   file1
file6 is unique