Sentence:Orion, a giant stellar [e1]nursery[/e1] which has spawned roughly 20,000 low-mass [e2]stars[/e2] like the sun in the last 10 million years, also harbors a handful of massive type O and B stars that emit blowtorch-like radiation.
 e1: nursery. 
 e2 : stars.
Answer: Member-Collection(e2,e1)