Regarding 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 that: Xiao Zhang is older than the teacher; Xiao Wang and the doctor are not of the same age The doctor is younger than Xiao Li. It follows that ______. ['Xiao Wang is a lawyer, Xiao Li is a doctor, Xiao Zhang is a teacher.', 'Xiao Wang 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.']