['they', 'know', 'frequency', 'EmptyParameter', 'EmptyParameter'] ['they', 'know', 'system', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'comprehend-87.2', "Synset('magnitude_relation.n.01')", 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'comprehend-87.2', "Synset('physical_entity.n.01')", 'EmptyParameter', 'EmptyParameter']
They knew their shield frequencies and which systems to target.
<PRP> knew <PRP> Synset('protective_covering.n.01') Synset('magnitude_relation.n.01') and which Synset('physical_entity.n.01') to target.