File: filter_stanza.awk

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valgrind 1%3A3.24.0-3
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file content (22 lines) | stat: -rw-r--r-- 281 bytes parent folder | download | duplicates (2) 
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BEGIN {
   main=""
   stanza=""
}
/main/ {
   if ($0 != main) {
      # first or different stanza
      print stanza$0
      main=$0
      stanza=""
   } else {
      # duplicate stanza
      main=$0
      stanza=""
   }
   next
}

{ 
   # other lines
   stanza = stanza $0 "\n"
}