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while (<STDIN>) {
   if (/a/i && /e/i && /i/i && /o/i && /u/i)) {
       print;
   }
}

while ( defined ($line = <STDIN>) ) {
   if ($line =~ (/a/i && /e/i && /i/i && /o/i && /u/i)) {
      print $line;
   }
}