Sentence:The 13th Gate offers 13 themed experiences to make every nightmare seem real from crawling through a crematory oven and an old hearse to being lost in dark underground tunnels or finding yourself standing on a rickety bridge over a [e1]bed[/e1] of live [e2]snakes[/e2].
 e1: bed. 
 e2 : snakes.
Answer: Member-Collection(e2,e1)