['seven', 'explain', 'background', 'EmptyParameter', 'EmptyParameter']
['<PERSON>4', 'transfer_mesg-37.1.1', "Synset('situation.n.01')", 'EmptyParameter', 'EmptyParameter']
Seven explains Crewman Harren's background.
<PERSON>4 explains <PERSON>9 Harren's Synset('situation.n.01').