Sentence:The "Intihuatana" (in Quechua = place where the sun is bonded) is a solar observatory that allowed the Incas to keep track of the seasons of the year and the flow of time based on the [e1]shadows[/e1] caused by the [e2]sun[/e2] over the stone.
 e1: shadows. 
 e2 : sun.
Answer: Product-Producer(e2,e1)