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    #!/usr/bin/perl
use strict;
...
          'line 20',
          'line 21'
        ];
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line 2
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    #!/usr/bin/perl
use strict;
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        ];
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    #!/usr/bin/perl
use strict;
...
          'line 20',
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        ];
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    do {
    @data = check_file($filename, $numlines);
    sleep 5;
} while ( grep not /$process/, @data );