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  1. or download this
    @interesting_lines = grep /$string1/,
                     grep /$string2/,
                     @log;
  2. or download this
    @interesting_lines = grep /$string1/ && /$string2/, @log;
  3. or download this
    @interesting_lines = grep /^(?=.*$string1)(?=.*$string2)/, @log;