['slipstream', 'start', 'EmptyParameter', 'collapse', 'to']
["Synset('natural_process.n.01')", 'begin-55.1', 'EmptyParameter', "Synset('motion.n.06')", 'to']
The slipstream starts to collapse.
the Synset('natural_process.n.01') starts to Synset('motion.n.06').