Sentence:Over the next six years, the [e1]army[/e1] built a [e2]wall[/e2] 80 Roman miles long (117km or 73 modern miles), some 5 metres (15 feet) high, east to west from Wallsend to Bowness.
 e1: army. 
 e2 : wall.
Answer: Product-Producer(e2,e1)