['ship', 'have', 'meter', 'EmptyParameter', 'EmptyParameter']
["Synset('craft.n.02')", 'own-100', "Synset('sound_property.n.01')", 'EmptyParameter', 'EmptyParameter']
The ships have to be less than fifty meters apart.
the Synset('craft.n.02') have to be Synset('less.a.01') than fifty Synset('sound_property.n.01') apart.