Global symbol "$line" requires explicit package name at day1_test.1.pl line 5. Global symbol "$line" requires explicit package name at day1_test.1.pl line 5. Global symbol "@lines" requires explicit package name at day1_test.1.pl line 6. Global symbol "$line" requires explicit package name at day1_test.1.pl line 6. Global symbol "@lines" requires explicit package name at day1_test.1.pl line 8. Execution of day1_test.1.pl aborted due to compilation errors.