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

### Instruction:
What is the average number of not usable satellited when there are 0 retired, and the launch failures are less than 1?

### Inputs:
table_name: table, columns: ['Block', 'Launched', 'Operational', 'Not usable', 'Retired', 'Launch Failures']

### Response:
SELECT AVG Not usable FROM table WHERE Retired = 0 AND Launch Failures < 1