['he', 'play', 'EmptyParameter', 'engineer', 'with']
['<PRP>', 'trifle-105.3', 'EmptyParameter', "Synset('causal_agent.n.01')", 'with']
He played with the female engineer.
<PRP> played with the Synset('female.a.01') Synset('causal_agent.n.01').