['native', 'conceive', 'EmptyParameter', 'antimatter', 'of']
["Synset('living_thing.n.01')", 'characterize-29.2', 'EmptyParameter', "Synset('physical_entity.n.01')", 'of']
But, the natives had never conceived of antimatter.
But, the Synset('living_thing.n.01') had never conceived of Synset('physical_entity.n.01').