['what', 'modify', 'system', 'EmptyParameter', 'EmptyParameter'] ['they', 'appear', 'modify', 'EmptyParameter', 'EmptyParameter']
['what', 'other_cos-45.4', "Synset('artifact.n.01')", 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'appear-48.1.1', 'other_cos-45.4', 'EmptyParameter', 'EmptyParameter']
What they appeared to have been modifying systems.
what <PRP> appeared to have been modifying Synset('artifact.n.01').