query: SELECT model_name FROM chip_model EXCEPT SELECT chip_model FROM phone WHERE Accreditation_type  =  'Full'
question: Find the names of the chip models that give any phone use
query_toks: SELECT model_name FROM chip_model EXCEPT SELECT chip_model FROM phone WHERE Accreditation_type = 'Full '
query_toks_no_value: select model_name from chip_model except select chip_model from phone where accreditation_type = value
question_toks: Find the names of the chip models that give any phone use