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_8 (r_51_o VARCHAR, d_42_o VARCHAR)
### Question:
Which R 51 O value corresponds to a D 42 O value of r 19?
### Answer:
SELECT r_51_o FROM table_name_8 WHERE d_42_o = "r 19"