HOMEWORK 9
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This is an optional homework and it will not be graded.
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Missionaries and Cannibals

  * There are three missionaries and three cannibals 
    on the left bank of a river.
  * They wish to cross over to the right bank using 
    a boat that can only carry two at a time.
  * The number of cannibals on either bank must never 
    exceed the number of missionaries on the same bank, 
    otherwise the missionaries will become the cannibals' 
    dinner!
  * The number of missionaries on either bank must never 
    exceed the number of cannibals on the same bank, 
    otherwise the missionaries will become the cannibals!

Plan a sequence of crossings that will take everyone safely 
across.