Sentence:The impossibility of attending with frequency congregations gathered in various parts of the kingdom, led before long to the employment of lay speakers; and these in turn gradually gave place to an established [e1]order[/e1] of itinerant [e2]preachers[/e2]; and later these again to ministers settled for a limited period, with superintending bishops.
 e1: order. 
 e2 : preachers.
Answer: Member-Collection(e2,e1)