['they', 'pick', 'signal', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'get-13.5.1', "Synset('psychic_energy.n.01')", 'EmptyParameter', 'EmptyParameter']
Suddenly, they pick up three distinct signals, belonging to Duras' three ships.
Suddenly, <PRP> pick up three Synset('distinct.a.02') signals, belonging to Duras' three Synset('craft.n.02').