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I believe it is 12, but it is undefined. Some states it may be 7-8 as the least depending on the size or the need, but from my knowledge I think I am close to correct or spot on.
I hope this helped you !
ans.
The Treaty of Portsmouth formally ended the Russo-Japanese War of 1904–05. The negotiations took place in August in Portsmouth, New Hampshire, and were brokered in part by U.S. President Theodore Roosevelt.
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Roman engineers used inverted siphons to move water across a valley if they judged it impractical to build a raised aqueduct. The Roman legions were largely responsible for building the aqueducts. Maintenance was often done by slaves. The Romans were among the first civilizations to harness the power of water.
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