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 cmi_cross_references (source_system_code VARCHAR)
### Question:
Which distinct source system code includes the substring 'en'?
### Answer:
SELECT DISTINCT source_system_code FROM cmi_cross_references WHERE source_system_code LIKE '%en%'