SCHEMA:
CREATE TABLE table_name_7 (presentation_of_credentials VARCHAR, title VARCHAR, representative VARCHAR)
USER:
What is the presentation of credentials date of raúl h. castro, who has a title of ambassador extraordinary and plenipotentiary?

QUERY:
SELECT presentation_of_credentials FROM table_name_7 WHERE title = "ambassador extraordinary and plenipotentiary" AND representative = "raúl h. castro"