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

### Instruction:
What is the average number of partners for the firm with a rank under 71, other over 77, and largest city of Philadelphia?

### Inputs:
table_name: table, columns: ['Rank\u2003', 'Largest U.S. City\u2003', 'Total', 'Partners\u2003', 'Other']

### Response:
SELECT AVG Partners FROM table WHERE Rank < 71 AND Largest U.S. City = philadelphia AND Other > 77