Sentence:A Suffolk ram was removed from the flock and test mated to unrelated Suffolk [e1]ewes[/e1] in another [e2]flock[/e2]; 14 of the resulting 43 lambs born in 1984 had an identical congenital renal disease.
 e1: ewes. 
 e2 : flock.
Answer: Member-Collection(e1,e2)