A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results were as follows: 32 said they drove alone. 27 rode in a carpool. 28 rode public transportation. 6 used both carpools and public transportation. 8 used both a carpool and sometimes their own cars. 9 used buses as well as their own cars. 4 used all three methods. How many used none of the above-mentioned means of transportation? students

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