['tunnel', 'reach', 'EmptyParameter', 'kilometer', 'EmptyParameter']
["Synset('passage.n.03')", 'reach-51.8', 'EmptyParameter', "Synset('linear_unit.n.01')", 'EmptyParameter']
The tunnels ahead of them reach out for thousands of kilometers.
the Synset('passage.n.03') ahead of <PRP> reach out for Synset('integer.n.01') of Synset('linear_unit.n.01').