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

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Text this: Amplify-and-forward based two-way relay ARQ system with relay combination