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

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Text this: Rod-structure classification of gravitational instantons with U(1)×U(1) isometry