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In the diagram shown above, all valves are initially closed. Which valves must be opened to allow water to flow from point A to points B and D but NOT to points C and E?

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<img src='https://www.fatskills.com/images3/firefighter/9dd9f549bda693d09551e37a1e3675bc.gif' border='0' alt='0267-01.gif' /><br>In the diagram shown above, all valves are initially closed. Which valves must be opened to allow water to flow from point A to points B and D but NOT to points C and E?






 
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