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Why does this Perl one-liner does not drop the last dupe?
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| $ echo x:x:y:y:z:x:y:z | perl -e 'print join(":", grep { !$seen{$_}++ } split(/:/, scalar <>))' | |
| x:y:z:z |
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It is supposed to remove all duplicate entries in a
:-delimited list while preserving the order in which unique components appear.