Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_46 ( permanent_account VARCHAR, userpics_free VARCHAR, registration VARCHAR )

### Question ###
Which permanent account has registration of invite-only and userpics free of unknown?

### Accurate SQL ###

SELECT permanent_account FROM table_name_46 WHERE userpics_free = "unknown" AND registration = "invite-only"