CREATE TABLE table_13277 ("School" TEXT, "Location" TEXT, "Mascot" TEXT, "IHSAA Class" TEXT, "County" TEXT, "Year Joined" TEXT, "Year Left" TEXT, "Conference Joined" TEXT)

Which school joined in 1971 and left in 1975?
SELECT "School" FROM table_13277 WHERE "Year Joined" = '1971' AND "Year Left" = '1975'
SELECT "School" FROM "table_13277" WHERE "Year Joined" = '1971' AND "Year Left" = '1975'