Graph IV. N={1, 2, 3, 4, 5, 6} № = {1} N = {6} E={(1,2), (2,3), (2, 6), (3,4), (3,5), (4,5), (5.2)) def(x) = {1, 5} use(x)=(5, 6) // Assume the use of x in 5 pre- cedes the def Test Paths: t1 = [1, 2, 6] 12 [1, 2, 3, 4, 5, 2, 3, 5, 2, 6] 13 [1, 2, 3, 5, 2, 3, 4, 5, 2, 6]