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I am trying to make a program that takes what you input, and encrypts it by turning a to p, b to q, z to b, etc.  It moves the letter 2 spaces to the left (a to c) and moves it down (c to p).  (See below.)  Even though you can just say that a will be n, how do you seperate each letter and turn it into a string?  Please put it in terms that a Ruby beginner would understand.
  abcdefghijklm
  nopqrstuvwxyz

       
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