a of a " minimal path of a path of a top of a path of a normal path of a acceptable path of a unique path of a common path of a minimal path of a path of a unique path of a normal path of a the a of a " " " " " " " " " " " " " that of a " " " " " " " " " " " " " " " " " " " " a " " " " " " " in a " " " " " " " " " " " " " " " " " " " " a " " " in a " " " " " " " " a " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " in a " " " " " " " " " " " " ", " " " " " " " " " " " " " " " " " " " " the " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " "." " " " " " " " " " " " " " " " " " " " " " " " " " "." " " " " " " " " " " " " " " the " " " " " " "