Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
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?
### Answer:
SELECT permanent_account FROM table_name_46 WHERE userpics_free = "unknown" AND registration = "invite-only"