④:0,2,10,2,3)(0,4,1)0,4,3)(0,5,1)但0,5,3》(0,6,1) (0,6,3)(0,8,1)(0,8,3) 3,5,2)(3,5,4)③3,6,2)③3,6,4 (3,8,2)(3,8,4)485)4,8,6) ⊙:0.0,1)⑩0,0,3)(0,7,1)0,7,3)(1,0,2)(1,1,2)(1,3,2) 4,2(1,5,2)(1,6,2)(1,7,2)(1,8,2(3,0,2)③3,0,4) (3,1,2)③3,1,4(3,3,2)(3,3,4③3,7,2)(3,7,4)4,0,5) 40,6)4,1,5)4,1,6)4,2,5)4,2,6)14,3,5)4,3,6 445)4,4,6)(4,7,5)(4,7,6)6,0,8)(6,1,8)(6,2,8) (6,3,8)(6,4,8)(6,5,8)(6,6,8)(6,7,8)(7,0,67,0,8) 门,1,6)(7,1,87,2,6)7,2,8)7,3,67,3,8)7,4.6 7,4,8)(7,5,67,5,8)7,7,67,78) can-reach(X3, X2) 1.13030530630.3.54 3643448,6 can-reach(X, X2 )+ linked-to(X,, X2)can-reach(X3 ,X2 )