In the following question, the first sentence (S1) and the last sentence (S6) are fixed. The middle four sentences (P, Q, R, S) are jumbled. Choose the option that provides the correct sequence.

S1: The study of ancient Mesopotamian law provides insight into early state organization. P: These codes established principles of social hierarchy and criminal justice. Q: The most famous of these documents is the Code of Hammurabi. R: Before this, justice was often dispensed arbitrarily by local leaders. S: The development of written legal codes marked a crucial step in this process. S6: The influence of these early laws can still be seen in modern jurisprudence.