query: SELECT lname FROM student WHERE sex  =  'F' AND city_code  =  'BAL' UNION SELECT lname FROM student WHERE sex  =  'M' AND age  <  20
question: Are Finding the last name of students who is either female (sexes are F) and living in city of codes BAL or male (sexes are M) and in ages of below 20.
query_toks: SELECT lname FROM student WHERE sex = 'F ' AND city_code = 'BAL ' UNION SELECT lname FROM student WHERE sex = 'M ' AND age < 20
query_toks_no_value: select lname from student where sex = value and city_code = value union select lname from student where sex = value and age < value
question_toks: Are Finding the last name of students who is either female (sexes are F) and living in city of codes BAL or male (sexes are M) and in ages of below 20.