['they', 'remain', 'EmptyParameter', 'leave', 'until'] ['they', 'flee', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'exist-47.1', 'EmptyParameter', "Synset('time_period.n.01')", 'until'] ['<PRP>', 'escape-51.1-1-1', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
They must remain there until the Borg leave, and then they must flee on a heading.
<PRP> must remain there until the <PERSON>0 leave, and then <PRP> must flee on a heading.