['doctor', 'show', 'problem', 'he', 'EmptyParameter']
['<PERSON>0', 'indicate-78', "Synset('cognitive_factor.n.01')", '<PRP>', 'EmptyParameter']
The doctor could show him the problem.
<PERSON>0 could show <PRP> <PERSON>0 Synset('cognitive_factor.n.01').