['they', 'need', 'maintain', 'EmptyParameter', 'EmptyParameter'] ['they', 'maintain', 'silence', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'require-103-2', 'declare-29.4-1', 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'declare-29.4-1', "Synset('trait.n.01')", 'EmptyParameter', 'EmptyParameter']
They need to maintain radio silence.
<PRP> need to maintain Synset('set.n.13') Synset('trait.n.01').