user: Question: What is Userpics Free, when Monthly Cost For Paid Account is "Unknown", and when S Registered User is 2340?
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']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Asks', '2006', '13127', '31', 'Open', 'Unknown', '3', 'Unknown', 'Unknown', 'Unknown', 'Unknown']
SQL:

assistant: SELECT "Userpics Free" FROM "Table" WHERE "Monthly Cost for Paid Account" = 'Unknown' AND "s Registered user" = '2340';