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  _____      ___      _  _      ___    __    __  
 /  ___||   / _ \\   | \| ||   / _ \\  \ \\ / // 
| // __    / //\ \\  |  ' ||  | / \ ||  \ \/ //  
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  `---`   `-`   `-`  `-` -`    `---`       `

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Text this: On-demand spectrum sharing by flexible time-slotted cognitive radio networks