user: Question: How many different classes of verbs are there whose part 3 is lucon?
Columns: ['Class', 'Part 1', 'Part 2', 'Part 3', 'Part 4', 'Verb meaning']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'rīdan', 'rād', 'ridon', 'riden', 'to ride']
SQL:

assistant: SELECT COUNT("Class") FROM "Table" WHERE "Part 3" = 'lucon';