user: Question: What year was the school opened that has a size of 10 acres and students of NA?
Columns: ['Campus', 'Year opened', 'Students', 'Size', 'Location']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Hialeah Campus', '1980 2005 (Official designation)', 'NA', '8 acres', 'Hialeah']
SQL:

assistant: SELECT "Year opened" FROM "Table" WHERE "Students" = 'NA' AND "Size" = '10 acres';