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|  __ \\   |  ___|| | |  | || | || | ||  /_____// 
| |  \ ||  | ||__   | |/\| || | || | ||  `____ `  
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|_____//   |_____|| |_// \_||  \____//   `__ `    
 -----`    `-----`  `-`   `-`   `---`    /_//     
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Text this: On 2-factor hamiltonian regular bipartite graphs