['they', 'reach', 'end', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'body_motion-49.2-1-1', "Synset('happening.n.01')", 'EmptyParameter', 'EmptyParameter']
They've reached an evolutionary dead end.
They've reached an Synset('evolutionary.a.01') Synset('dead.a.02') Synset('happening.n.01').