['one', 'keep', 'trap', 'EmptyParameter', 'EmptyParameter'] ['they', 'trap', 'EmptyParameter', 'day', 'for']
['one', 'keep-15.2', 'pocket-9.10', 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'pocket-9.10', 'EmptyParameter', '<DURATION>2', 'for']
The wild one may keep them trapped there for several days.
the Synset('wild.a.02') one may keep <PRP> trapped there for <DURATION>2.