['they', 'follow', 'trail', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'chase-51.6', "Synset('road.n.01')", 'EmptyParameter', 'EmptyParameter']
They follow its ion trail to.
<PRP> follow <PRP> Synset('body.n.04') Synset('road.n.01') to.