A crime has been committed. There are 4 suspects, John, Johnny, Johnson & Joe. An investigation revealed that only 1 of the 4 suspects was responsible for the crime. However, a subsequent investigation proved that only 1 of the 4 suspects' statements was true. The suspects made the following statements:
1. John said, "I didn't do it."
2. Johnny said, "John is lying."
3. Johnson said, "Johnny is lying."
4. Joe said, "Johnny did it."
Who is guilty?
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