['they', 'discover', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'discover-84', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
They also discover what's wrong with the Klingon ship's engines.
<PRP> also discover what's Synset('incorrect.a.01') with the <ORGANIZATION>0 ship's Synset('wheeled_vehicle.n.01').