CREATE TABLE table_71879 ("Representative" TEXT, "Title" TEXT, "Presentation of Credentials" TEXT, "Termination of Mission" TEXT, "Appointed by" TEXT)

What is the presentation of credentials date of ra l h. castro, who has a title of ambassador extraordinary and plenipotentiary?
SELECT "Presentation of Credentials" FROM table_71879 WHERE "Title" = 'ambassador extraordinary and plenipotentiary' AND "Representative" = 'raúl h. castro'
SELECT "Presentation of Credentials" FROM "table_71879" WHERE "Representative" = 'raúl h. castro' AND "Title" = 'ambassador extraordinary and plenipotentiary'