['he', 'think', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter'] ['he', 'find', 'system', 'EmptyParameter', 'EmptyParameter'] ['he', 'operate', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'focus-87.1-1', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'declare-29.4', "Synset('plan.n.01')", 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'other_cos-45.4', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
He thinks he's found an environmental system, which he operates.
<PRP> thinks he's found an Synset('environmental.a.02') system, which <PRP> operates.