· About Xiao Wang, Xiao Li and Xiao Zhang, we know that one of them is a lawyer, one is a doctor, and one is a teacher, and we also know: Xiao Zhang is older than the teacher; Xiao Wang and the doctor are different Years; doctors are younger than Xiao Li. From this we know:. ['Xiao Wang is a lawyer, Xiao Li is a doctor, Xiao Zhang is a teacher.', 'Xiao Ren is a doctor, Xiao Li is a teacher, and Xiao Zhang is a lawyer.', 'Xiao Wang is a teacher, Xiao Li is a lawyer, Xiao Zhang is a doctor.', 'Xiao Wang is a teacher, Xiao Li is a doctor, Xiao Zhang is a lawyer.']