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how far below the year's high mark had the water level fallen?

In May, the water level of a reservoir reached its high mark for the year. During the summer months, as water usage increased, the level dropped. In the months of May and June, it fell 3.3 feet each month. In August and September, because of high temperatures, it fell another 7.7 feet each month. By the beginning of October, how far below the year's high mark had the water level fallen?

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