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

### Instruction:
What is the S Registered User, when Userpics Free is 6 [free] or 15 [plus]?

### Inputs:
table_name: table, columns: ['Name', 'Year Began', 's Registered user', 'Updated in past 30 days', 'Registration', 'Ability to syndicate off-site feeds', 'Userpics Free', 'Userpics Paid', 'Monthly Cost for Paid Account', 'Yearly Cost for Paid Account', 'Permanent Account']

### Response:
SELECT s Registered user FROM table WHERE Userpics Free = 6 [free] or 15 [plus]