['he', 'hit', 'EmptyParameter', 'idea', 'on']
['<PRP>', 'hit-18.1-1', 'EmptyParameter', "Synset('cognition.n.01')", 'on']
He hits on the idea of compressing the data stream.
<PRP> hits on the Synset('cognition.n.01') of compressing the <PERSON>10 Synset('thing.n.12').