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

### Instruction:
How many first downs did the bills have when their opponent had 6

### Inputs:
table_name: table, columns: ['Game', 'Date', 'Opponent', 'Result', 'Bills points', 'Opponents', 'Bills first downs', 'Record']

### Response:
SELECT MIN Bills first downs FROM table WHERE Opponents = 6