What is the last name of every student who is either female or living in a city with the code BAL or male and under 20?
SELECT lname FROM student WHERE sex  =  'F' AND city_code  =  'BAL' UNION SELECT lname FROM student WHERE sex  =  'M' AND age  <  20
SELECT lname FROM student WHERE sex  =  'F' AND city_code  =  'BAL' UNION SELECT lname FROM student WHERE sex  =  'M' AND age  <  20
[{'LName': 'Andreou'}, {'LName': 'Brody'}, {'LName': 'Epp'}, {'LName': 'Goldman'}, {'LName': 'Han'}, {'LName': 'Lee'}, {'LName': 'Nelson'}, {'LName': 'Norris'}, {'LName': 'Pang'}, {'LName': 'Prater'}, {'LName': 'Schultz'}, {'LName': 'Schwartz'}, {'LName': 'Simms'}, {'LName': 'Smith'}, {'LName': 'Tai'}, {'LName': 'Woods'}]