['he', 'say', 'EmptyParameter', 'nickname', 'EmptyParameter']
['<PRP>', 'say-37.7-1-1', 'EmptyParameter', "Synset('language_unit.n.01')", 'EmptyParameter']
He says was only his nickname.
<PRP> says was only <PRP> Synset('language_unit.n.01').