['they', 'find', 'information', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'declare-29.4', "Synset('system_of_measurement.n.01')", 'EmptyParameter', 'EmptyParameter']
Finally they find information about the mysterious ship.
finally <PRP> find Synset('system_of_measurement.n.01') about the mysterious Synset('craft.n.02').