Sentence:In the autumnal season, a [e1]phalanx[/e1] of [e2]storks[/e2], herons, or swans, mounts into the heavens, like an ascending pyramid, to migrate from the frigid to the torrid zone.
 e1: phalanx. 
 e2 : storks.
Answer: Member-Collection(e2,e1)