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Truth/Lies Logic Puzzles

Instructions: Someone committed a crime, and the police have gathered statements from everyone. Use logic and the fact that each person either always lies or always tells the truth to figure out who is the guilty party!

See the answer for last week's puzzle

Alice said:

Only one of us, Sharon or I, tell the truth.
I always tells the truth.
Dennis said:
Jose tells the truth
Robert played the practical joke on the teacher.
Diane said:
Exactly one of Mary and Alice lies..
Alice played the practical joke on the teacher.
Jose said:
Sharon isn't telling the truth
I didn't play a practical joke on my teacher.
Mary said:
Exactly one of Jose and Robert tells the truth..
Robert played the practical joke on the teacher.
Robert said:
Both Sharon and Alice lie.
Sharon played the practical joke on the teacher.
Sharon said:
Alice never tells the truth.
Dennis played the practical joke on the teacher.

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