DERP

(define (A x y)
(cond ((= y 0) 0)
((= x 0) (* 2 y))
((= y 1) 2)
(else (A (- x 1)
(A x (- y 1))))))
I understand everything up until the else.
HALP.

By that I mean, it calls itself with the first line of the else, but would it ever get to the second line? It keeps calling itself until one of the conditions is met at the first line. Why is there a second line if it's never used?