['they', 'realize', 'EmptyParameter', 'smile', 'EmptyParameter'] ['what', 'go', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'comprehend-87.2', 'EmptyParameter', "Synset('gesture.n.02')", 'EmptyParameter'] ['what', 'occur-48.3', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
They both realize what's going on and smile at each other.
<PRP> both realize what's going on and Synset('gesture.n.02') at each Synset('other.a.01').