['signal', 'have', 'call', 'EmptyParameter', 'EmptyParameter']
["Synset('abstraction.n.06')", 'own-100', "Synset('auditory_communication.n.01')", 'EmptyParameter', 'EmptyParameter']
The alien's signal may have in fact been a distress call.
the alien's Synset('abstraction.n.06') may have in Synset('cognition.n.01') been a Synset('appropriation.n.03') Synset('auditory_communication.n.01').