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|      \\  |  ___||  | \| || | || | ||  /_____// 
|  --  //  | ||__    |  ' || | || | ||  `____ `  
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|______//  |_____||  |_|\_||  \____//   `__ `    
`------`   `-----`   `-` -`    `---`    /_//     
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Text this: Simulation of a novel intermittent ventilation system for underground mines