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_79 (lightweight VARCHAR, information_model VARCHAR, flexible VARCHAR)
### Question:
What is the lightweight value with no information model and the flexible value is unknown?
### Answer:
SELECT lightweight FROM table_name_79 WHERE information_model = "no" AND flexible = "unknown"