user: Question: List the possible children per donor levels for countries where the allowed recipients is no data.
Columns: ['Country', 'Donor payment', 'Children per donor', 'Donor anonymity', 'Allowed recipients']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Belgium', 'no data', '6 children', 'varies', 'no data']
SQL:

assistant: SELECT "Children per donor" FROM "Table" WHERE "Allowed recipients" = 'no data';