How many students are there? That's missing from your query.
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what is the question I do not understand
Originally humans simply hunted and gathered, but this nomadic lifestyle made having a large family difficult and culture was therefore rarely passed on.
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They developed many new techniques for buildings and construction of all types including the invention of concrete, Roman roads, the invention of Roman arches, and incredibly well built aqueducts that ran for miles before they reached the end and delivered fresh water.
