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| |  | ||  /_   _// | || | ||   / _ \\   \ \\/ // 
| |/\| ||   -| ||-  | '--' ||  / //\ \\   \   //  
|  /\  ||   _| ||_  | .--. || |  ___  ||  / . \\  
|_// \_||  /_____// |_|| |_|| |_||  |_|| /_//\_\\ 
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Text this: Electric field effect in ultrathin black phosphorus