If you don't care about the order of the output, you could just use a hash instead of the Perl6::Junction CPAN module. How's this for ugly... 
perl -ne '$h{$_}++}{print for keys%h' tt.txt

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Update: not to mention sort... 

sort -u tt.txt

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In reply to Re: one line for combining line by toolic
in thread one line for combining line by xiaoyafeng

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