['ship', 'arrive', 'defend', 'EmptyParameter', 'EmptyParameter'] ['ship', 'defend', 'they', 'EmptyParameter', 'EmptyParameter']
["Synset('craft.n.02')", 'escape-51.1-1', 'defend-72.3', 'EmptyParameter', 'EmptyParameter'] ["Synset('craft.n.02')", 'defend-72.3', '<PRP>', 'EmptyParameter', 'EmptyParameter']
Their mother ship has arrived to defend them.
<PRP> Synset('genitor.n.01') Synset('craft.n.02') has arrived to defend <PRP>.