google for the package bootstrap-4.0.0-dist.zip, and test on its file. * test on bootstrap5.css (renamed file from bootstrap 5) is passed, * test on bootstrap4.css (renamed file from bootstrap 4) fails. ``` user@PC:~/fcl-css$ ./extractcssclasses -o 5.txt bootstrap5.css user@PC:~/fcl-css$ ./extractcssclasses -o 4.txt bootstrap4.css Exception at 000000000047FF8A: EAccessViolation: Access violation. user@PC:~/fcl-css$ ```