2.　　农夫和小米问题：农夫、狐狸、鸡和米都在一条河的左岸，现在要把它们全部送到右岸去，农夫有一条船，过河时，除农夫外，船上至多能载狐狸、鸡和米中的一样。狐狸要吃鸡，鸡要吃米，除非农夫在那里。试编程求出所有能确保全部安全的过河的计划，并给出Visual Prolog程序。-2. Farmer and millet issues: the farmer, the fox, chicken and rice are in a river' s left bank, and now all of them should go to the right bank, the farmer has a boat to cross the river, in addition to farmers, the ship can carry up to Fox, the same as chicken and rice. Fox to eat chicken, chicken eat rice, unless the farmers there. Find all testing program to ensure that all security plans across the river, and gives Visual Prolog program.