['they', 'find', 'primitive', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'declare-29.4', "Synset('causal_agent.n.01')", 'EmptyParameter', 'EmptyParameter']
They are found to be primitives of pre-Bronze Age level.
<PRP> are found to be Synset('causal_agent.n.01') of pre-bronze <DATE>0 Synset('device.n.01').