1 3 入 a(u,v,w, A) B: =do(u, v, w, 1) a(u, v, w, i) do(u, v, w,2)E dd (u, v, w, 2)F d d dudy dvd duduu 1 3 := v -2 3 := w 2 3 := l 3 2 := A 2 u F (u, v,w,l) d d 2 := B 2 v F (u, v,w,l) d d 2 := C 2 w F(u,v,w, l) d d 2 := D u v F(u,v,w, l) d d d d := E v w F(u, v,w, l) d d d d := v w F(u, v,w, l) d d d d F w u F(u,v,w, l) d d d d := A = 3 B = 3 C = 3