Natural join by definition. Show the steps of computing natural join of relations of r and s (shown below) using the definition of natural join (i.e., do not use any particular join algorithm as discussed in the lecture). In other words, you should show Cartesian product as the intermediate step, then the result of selection, etc. [The objective of this exercise is to understand how natural join is defined, and how it differs from the algorithms which are used to implement the join operation.]

r (two tables r and s) s

A	B		B	C
3	23		25	f
3	25		23	g
4	72		72	h
6	18		23	k
			59	x