sentences:  Its large urban centres of Mohenjo-daro and Harappa very likely grew to containing between 30,000 and 60,000 individuals, and the civilisation itself during its florescence may have contained between one and five million individuals.Mohenjo-daro has a planned layout with rectilinear buildings arranged on a grid plan.Most were built of fired and mortared brick; some incorporated sun-dried mud-brick and wooden superstructures.