query: SELECT DISTINCT zip_code FROM weather EXCEPT SELECT DISTINCT zip_code FROM weather WHERE max_dew_point_f  >=  70
question: What-all all the different zip code have one maximum dew point was always below 70?
query_toks: SELECT DISTINCT zip_code FROM weather EXCEPT SELECT DISTINCT zip_code FROM weather WHERE max_dew_point_f > = 70
query_toks_no_value: select distinct zip_code from weather except select distinct zip_code from weather where max_dew_point_f > = value
question_toks: What-all all the different zip code have one maximum dew point was always below 70?