CREATE TABLE table_21717 ("Class" TEXT, "Part 1" TEXT, "Part 2" TEXT, "Part 3" TEXT, "Part 4" TEXT, "Verb meaning" TEXT, "Usual PIE origin" TEXT)

For part 2 *raid, what is listed for part 3?
SELECT "Part 3" FROM table_21717 WHERE "Part 2" = '*raid'
SELECT "Part 3" FROM "table_21717" WHERE "Part 2" = '*raid'