Text this: The selective formation of Di-σ N-Si linkages in pyrazine binding on Si(111)-7 × 7

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