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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

Gregory said:

Thomas doesn't lie
Sandra played the practical joke on the teacher.
Marie said:
Thomas never tells the truth.
Thomas played the practical joke on the teacher.
Nancy said:
Thomas doesn't lie
Gregory didn't play a practical joke on my teacher.
Sandra said:
Both Walter and Marie lie.
I don't lie.
Sarah said:
Walter always tells the truth
Marie played the practical joke on the teacher.
Thomas said:
Only one of us, Marie or I, tell the truth.
I never lie.
Walter said:
Thomas and Marie both tell the truth.
I never lie.

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