<Ul> <Li> Senatus consultum ultimum </Li> </Ul> <Li> Senatus consultum ultimum </Li> <Tr> <Th> Assemblies </Th> </Tr> <Tr> <Td> <Ul> <Li> Centuriate </Li> <Li> Curiate </Li> <Li> Plebeian </Li> <Li> Tribal </Li> </Ul> </Td> </Tr>

What is the central concept underlying the western legal system