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_35 (example_code__huc_ INTEGER, level VARCHAR, example_name VARCHAR, digits VARCHAR)
### Question:
What is the mean huc example code when the example name's lower snake, there are 6 digits, and less than 3 levels?
### Answer:
SELECT AVG(example_code__huc_) FROM table_name_35 WHERE example_name = "lower snake" AND digits = 6 AND level < 3