What are the course codes for every class that the student with the last name Smithson took?
SELECT T1.crs_code FROM CLASS AS T1 JOIN enroll AS T2 ON T1.class_code  =  T2.class_code JOIN student AS T3 ON T3.stu_num  =  T2.stu_num WHERE T3.stu_lname  =  'Smithson'
SELECT T1.crs_code FROM CLASS AS T1 JOIN enroll AS T2 ON T1.class_code  =  T2.class_code JOIN student AS T3 ON T3.stu_num  =  T2.stu_num WHERE T3.stu_lname  =  'Smithson'
[{'CRS_CODE': 'ACCT-211'}, {'CRS_CODE': 'CIS-220'}, {'CRS_CODE': 'QM-261'}]