['they', 'engage', 'EmptyParameter', 'equivalent', 'in']
['<PRP>', 'amuse-31.1', 'EmptyParameter', "Synset('mass.n.01')", 'in']
They engage in the Borg equivalent of falling asleep.
<PRP> engage in the <PERSON>4 Synset('mass.n.01') of falling asleep.