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_92 (length VARCHAR, engine_type VARCHAR, numbers VARCHAR)
### Question:
What is the length for a diesel engine with numbers of tbd (13 buses)?
### Answer:
SELECT length FROM table_name_92 WHERE engine_type = "diesel" AND numbers = "tbd (13 buses)"