You meet six men on a road side. The problem is that your wallet is mysteriously missing and you can't figure out if these men are truth tellers or not. So you ask a few questions and here are their answers:
Allan: "Fred stole it. Fred also hears quite well."
Barry: "Calvin is a liar. I did not steal it and I know Allan did not steal it."
Calvin: "Allan and Dwayne are both knights. Eddy stole it."
Dwayne: "Allan is a liar. I did not steal it."
Eddy: "Only 4 of us are knights. I did not steal it. I know Calvin did not steal it."
Fred: "I am deaf but read lips. Barry did not steal it."
Who stole the wallet?
P.S. You are sure that all of the men either lie or tell the truth. No one does both.
I got Allan & Carl are liars and the rest knights and no one stole the wallet. But usually these problems require one of the parties involved is guilty.
I noticed in Barry's statement "I KNOW Allan did not steal it." And in Eddy's statement "I KNOW Calvin did not steal it."
The key to the puzzle may be that one of the statements is a flawed judgement. Either Barry or Eddy percieves someone innocent but in reality is guilty.