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{

...
 #define intel 15
 #define intel_64 16
}

{
    #define mutex 13
...
 #define intel 15
 #define intel_64 16
}

{
 #define intel 15
 #define intel_64 16
}

my ($start, $stop) = (qr '#ifdef|#if|#ifndef|#else', qr '#endif');

...
     print file2 $_ ;
   }
}