The words run together if you just print the list, though $, can take care of that.... 
% perl -lane 'print grep !$s{$_}++, @F'
one two two three
onetwothree

% perl -lane '$,=$"; print grep !$s{$_}++, @F'
one two two three
one two theee

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-Blake

In reply to Re3: Removing repeated words by blakem
in thread Removing repeated words by abitkin

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