The three-digit number is unique to each individual county within a state , but to be unique within the entire United States , it must be prefixed by the state code .
DET ADJ NOUN AUX ADJ ADP DET ADJ NOUN ADP DET NOUN , CCONJ PART VERB ADJ ADP DET ADJ PROPN PROPN , PRON AUX AUX VERB ADP DET NOUN NOUN .