['they', 'try', 'perfect', 'technique', 'EmptyParameter']
['<PRP>', 'try-61.1', "Synset('perfect.a.01')", "Synset('know-how.n.01')", 'EmptyParameter']
They were trying to perfect their assimilation techniques.
<PRP> were trying to Synset('perfect.a.01') <PRP> Synset('learning.n.01') Synset('know-how.n.01').