['hail', 'get', 'response', 'EmptyParameter', 'EmptyParameter']
["Synset('physical_entity.n.01')", 'birth-28.2-1', "Synset('property.n.02')", 'EmptyParameter', 'EmptyParameter']
A hail to the cloaked ship gets no response.
a Synset('physical_entity.n.01') to the cloaked Synset('craft.n.02') gets no Synset('property.n.02').