Input (grade 13): The Early Classic settlement distribution in the northern Maya lowlands is not as clearly known as the southern zone, but does include a number of population centers, such as Oxkintok, Chunchucmil, and the early occupation of Uxmal.
Output (grade 11): Some known population centers in the north were Oxkintok, Chunchucmil, and the early occupation of Uxmal.