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_47 (year_built INTEGER, last_refurbished INTEGER)
### Question:
What is the earliest year built for the ship refurbished earlier than 2013?
### Answer:
SELECT MIN(year_built) FROM table_name_47 WHERE last_refurbished < 2013