['sign', 'be', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
["Synset('visual_communication.n.01')", 'representation-110.1', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
There is no sign of technology, ships, or even planets.
there is no Synset('visual_communication.n.01') of technology, ships, or even Synset('person.n.01').