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_73 (ihsaa_class VARCHAR, county VARCHAR, mascot VARCHAR)
### Question:
What is the IHSAA class for the school in 10 Clark county with mascot of the Mustangs?
### Answer:
SELECT ihsaa_class FROM table_name_73 WHERE county = "10 clark" AND mascot = "mustangs"