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  _____    _    _     ____       ___       _____  
 /  ___|| | || | ||  |  _ \\    / _ \\    / ___// 
| // __   | || | ||  | |_| ||  / //\ \\   \___ \\ 
| \\_\ || | \\_/ ||  | .  //  |  ___  ||  /    // 
 \____//   \____//   |_|\_\\  |_||  |_|| /____//  
  `---`     `---`    `-` --`  `-`   `-` `-----`

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Text this: Ultrathin Two-Dimensional Membranes Assembled by Ionic Covalent Organic Nanosheets with Reduced Apertures for Gas Separation