['he', 'hear', 'sound', 'EmptyParameter', 'EmptyParameter'] ['he', 'track', 'it', 'EmptyParameter', 'EmptyParameter'] ['it', 'launch', 'bay', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'discover-84', "Synset('part.n.01')", 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'chase-51.6', '<PRP>', 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'establish-55.5-1', "Synset('angiospermous_tree.n.01')", 'EmptyParameter', 'EmptyParameter']
Then, he hears a sound again, and tracks it to launch bay one.
Then, <PRP> hears a Synset('part.n.01') again, and tracks <PRP> to launch Synset('angiospermous_tree.n.01') one.