['he', 'find', 'treatment', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'declare-29.4', "Synset('manner.n.01')", 'EmptyParameter', 'EmptyParameter']
However he has found a possible treatment.
however <PRP> has found a Synset('potential.a.01') Synset('manner.n.01').