4o with thinking: By systematic (BFS) search of the entire 32-state space under these rules, one finds no path from to that stays always safe. Thus the puzz

4o with thinking: By systematic (BFS) search of the entire 32-state space under these rules, one finds no path from to that stays always safe. Thus the puzzle has no solution—there is no way for the man to ferry all four items across without at least one of them being eaten.