Directions: Use the vertical line test to identify if the given data is a function or not. Write F if the given data is function, otherwise, NF if it is not a function. 1. A = {(2,3), (1, 0), (4,8), (3,7)} 2. B = {(1, 1), (1,-1), (-1,0), (1,0)} 3. FOO 女 4. 1 中 00

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