6. On the porch of the house, a boy and a girl are sitting next to each other. Sasha says: "I am a boy." Zhena says: "I am a girl." If at least one of the children is lying, then who is the boy and who is the girl?
6. From the fact that one of them is lying, it follows that the second one is lying too. Therefore, Sasha is a girl, and Zhenya is a boy.