Sherlock Holmes had four suspects for the murder. Each one gave him two pieces of information. From his digital computerized lie-detector, Holmes knew that each suspect was telling one lie and telling the truth once. Here's what they said:
Suspect A : " I didn't do it. B did."
Suspect B : "A didn't do it. C did."
Suspect C : "B didn't do it. I did."
Suspect D : "C didn't do it. A did."
From this information, Holmes easily found the murderer. Can you!