A teacher had finished teaching for the day, and only 3 students, Rickie, Lisa, and Johnny were still there organizing their desks. The teacher left her cookie on the table and left the room, and when she came back, the cookie was gone. She questioned all the students, and these are the responses:
Rickie: I didn't do it!
Lisa: I didn't do it!
Johnny: Lisa did it!
...And if only one of them is telling the truth, who stole the cookie?
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Rickie is guilty. Lisa is the one who was honest, saying she didn't, Johnny claimed it was Lisa which was false, and Rickie lied when he said he didn't.