['it', 'run', 'EmptyParameter', 'reactor', 'by']
['<PRP>', 'run-51.3.2-2-1', 'EmptyParameter', "Synset('device.n.01')", 'by']
It is run by seven enormous fusion reactors, only three are still operational.
<PRP> is <ORGANIZATION>4 by <PERSON>15 enormous Synset('therapy.n.01') reactors, only three are still Synset('operational.a.03').