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  _  __   __   __   ______    _    _    _    _   
 | |/ //  \ \\/ // |      \\ | || | || | \  / || 
 | ' //    \ ` //  |  --  // | || | || |  \/  || 
 | . \\     | ||   |  --  \\ | \\_/ || | .  . || 
 |_|\_\\    |_||   |______//  \____//  |_|\/|_|| 
 `-` --`    `-`'   `------`    `---`   `-`  `-`

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Text this: Quantum memory process with a four-level atomic ensemble