CREATE TABLE table_21706 ("Class" TEXT, "Part 1" TEXT, "Part 2" TEXT, "Part 3" TEXT, "Part 4" TEXT, "Verb meaning" TEXT)

How many different classes of verbs are there whose part 3 is lucon?
SELECT COUNT("Class") FROM table_21706 WHERE "Part 3" = 'lucon'
SELECT COUNT("Class") FROM "table_21706" WHERE "Part 3" = 'lucon'