['space', 'contain', 'level', 'EmptyParameter', 'EmptyParameter']
["Synset('extent.n.02')", 'contain-15.4', "Synset('device.n.01')", 'EmptyParameter', 'EmptyParameter']
The space ahead contains high levels of radiation and metallic debris.
the Synset('extent.n.02') ahead contains Synset('high.a.04') Synset('device.n.01') of Synset('symptom.n.01') and Synset('metallic.a.01') Synset('waste.n.01').