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_28 (finish_construction VARCHAR, unit VARCHAR)
### Question:
What was the date that construction was finished when the unit was greifswald - 4 (kgr 4)?
### Answer:
SELECT finish_construction FROM table_name_28 WHERE unit = "greifswald - 4 (kgr 4)"