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

### Instruction:
What is the average episode that has September 11, 2007 as a region 1?

### Inputs:
table_name: table, columns: ['Volume', 'Discs', 'Episodes', 'Region 1 release', 'Region 2 release', 'Region 4 release']

### Response:
SELECT AVG Episodes FROM table WHERE Region 1 release = september 11, 2007