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while (my $line = <$log>){
   if (/recvd AA_BIN_MSG_VER_CHG/ .. /?:(Prepared to Send OK|Sending I
+nvalid credential)/){
      if (/Handling NSPAdvice for mechanism \[4\]/ .. /whatever_condit
+ion_to_reset_this_block/) {
...
      }
   }
}