['they', 'discuss', 'impression', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'chit_chat-37.6-1', "Synset('signal.n.01')", 'EmptyParameter', 'EmptyParameter']
They discuss their impressions of the Varro.
<PRP> discuss <PRP> Synset('signal.n.01') of the <PERSON>1.