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_21 (score VARCHAR, goal VARCHAR, result VARCHAR, competition VARCHAR)
### Question:
Which Score has a Result of 2–1, and a Competition of friendly, and a Goal smaller than 17?
### Answer:
SELECT score FROM table_name_21 WHERE result = "2–1" AND competition = "friendly" AND goal < 17