Update: How 'bout a 1 liner? 
perl -pale '$_="@{[grep !$s{$_}++, @F]}"'

[download]
original attempt below... 

my %seen;
print join(' ', grep !$seen{$_}++, split), "\n" while <STDIN>;

[download]

-Blake

In reply to Re: Removing repeated words by blakem
in thread Removing repeated words by abitkin

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