['they', 'use', 'language', 'EmptyParameter', 'EmptyParameter'] ['they', 'trade', 'he', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'use-105.1', "Synset('language_unit.n.01')", 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'exchange-13.6.1', '<PRP>', 'EmptyParameter', 'EmptyParameter']
They use sign language to communicate, and trade him for one of his collar pips.
<PRP> use Synset('visual_communication.n.01') Synset('language_unit.n.01') to communicate, and trade <PRP> for one of <PRP> Synset('strip.n.02') Synset('electronic_signal.n.01').