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/my/base_dir/t/
/my/base_dir/t/BaseSystems/
/my/base_dir/t/BaseSystems/0_foo.t
/my/base_dir/t/BaseSystems/1_bar.t
/my/base_dir/t/MainSystem/0_test_something.t

#!/usr/bin/perl

...
    }
    print "</span>\n";
}