['they', 'guess', 'EmptyParameter', 'function', 'as']
['<PRP>', 'discover-84', 'EmptyParameter', "Synset('work.n.01')", 'as']
They can guess as to its function, ie faster-than-light space travel.
<PRP> can guess as to <PRP> function, ie faster-than-light Synset('written_symbol.n.01') Synset('change.n.03').