Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the previous team of the United States player who had 2 NBA years and played the F position?

### Inputs:
table_name: table, columns: ['Pos.', 'Nationality', 'Previous team', 'NBA years [a ]', 'Career with the franchise [b ]']

### Response:
SELECT Previous team FROM table WHERE Nationality = united states AND NBA years [a ] = 2 AND Pos. = f