CREATE TABLE table_21721 ("Class" CLOB, "Part 1" CLOB, "Part 2" CLOB, "Part 3" CLOB, "Part 4" CLOB, "Verb meaning" CLOB)

What class is the verb wich its part 3 is heldu
SELECT "Class" FROM table_21721 WHERE "Part 3" = 'heldu'
SELECT "Class" FROM "table_21721" WHERE "Part 3" = 'heldu'