['nebula', 'begin', 'appear', 'EmptyParameter', 'EmptyParameter'] ['nebula', 'appear', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
['<MISC>0', 'begin-55.1-1-1', 'appear-48.1.1', 'EmptyParameter', 'EmptyParameter'] ['<MISC>0', 'appear-48.1.1', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter']
Then, a few seconds later, a new nebula begins to appear.
Then, <DATE>5 later, <DATE>5 Synset('new.a.06') <MISC>0 begins to appear.