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

### Instruction:
Which Week has a Result of l 13-16 and an Opponent of at buffalo bills?

### Inputs:
table_name: table, columns: ['Week', 'Date', 'TV Time', 'Opponent', 'Result']

### Response:
SELECT AVG Week FROM table WHERE Result = l 13-16 AND Opponent = at buffalo bills