CREATE TABLE table_50559 ("Name" CLOB, "Year Began" CLOB, "Registration" CLOB, "Userpics Free" CLOB, "Userpics Paid" CLOB, "Monthly Cost for Paid Account" CLOB, "Yearly Cost for Paid Account" CLOB, "Permanent Account" CLOB)

Which permanent account has registration of invite-only and userpics free of unknown?
SELECT "Permanent Account" FROM table_50559 WHERE "Userpics Free" = 'unknown' AND "Registration" = 'invite-only'
SELECT "Permanent Account" FROM "table_50559" WHERE "Registration" = 'invite-only' AND "Userpics Free" = 'unknown'