Find the names of the chip models that are not used by any phone with full accreditation type.
SELECT model_name FROM chip_model EXCEPT SELECT chip_model FROM phone WHERE Accreditation_type  =  'Full'
SELECT model_name FROM chip_model EXCEPT SELECT chip_model FROM phone WHERE Accreditation_type  =  'Full'
[{'Model_name': 'X3 Advanced'}, {'Model_name': 'X3 Basic'}, {'Model_name': 'X30 high-end'}, {'Model_name': 'X30 mid-range'}, {'Model_name': 'X3i'}, {'Model_name': 'X5 high end'}, {'Model_name': 'X50 Advanced'}, {'Model_name': 'X50 Standard'}, {'Model_name': 'X50v'}, {'Model_name': 'X51 low-end'}, {'Model_name': 'X51 mid-range'}]