['what', 'appear', 'frequency', 'EmptyParameter', 'EmptyParameter']
['what', 'appear-48.1.1', "Synset('magnitude_relation.n.01')", 'EmptyParameter', 'EmptyParameter']
It was due to the detection of what appeared to be a Federation frequency.
<PRP> was Synset('due.a.03') to the Synset('broadcasting.n.02') of what appeared to be a <ORGANIZATION>5 Synset('magnitude_relation.n.01').