['crew', 'have', 'stay', 'EmptyParameter', 'EmptyParameter'] ['crew', 'stay', 'EmptyParameter', 'board', 'on']
["Synset('unit.n.03')", 'own-100', 'exist-47.1', 'EmptyParameter', 'EmptyParameter'] ["Synset('unit.n.03')", 'exist-47.1', 'EmptyParameter', "Synset('electronic_device.n.01')", 'on']
Half the crew has to stay on board.
Synset('concept.n.01') the Synset('unit.n.03') has to stay on Synset('electronic_device.n.01').