This weekend a window in the neighborhood was broken. There were four children playing in the street at the time. We interrogated each of them until we received the following answers:
Robert: It was Leslie.
Leslie: Jason did it.
Jason: If Leslie says it was me, she’s lying.
Jennifer: I did not do it.
If only one of them is telling the truth, who broke the window? Why?
If only one of them is lying, who is guilty? Why?