['they', 'see', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'see-30.1-1-1', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
It is the face of a frozen humanoid figure, unlike anything they have ever seen.
<PRP> is the Synset('boundary.n.01') of a Synset('frozen.a.01') humanoid figure, unlike Synset('entity.n.01') <PRP> have ever seen.