user: Question: What are the episode numbers where the episode features Jack & Locke?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Featured character(s)', 'Original air date', 'U.S. viewers (million)']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['104/105', '1/2', '" LA X "', 'Jack Bender', 'Damon Lindelof & Carlton Cuse', 'Various', 'February2,2010', '12.09']
SQL:

assistant: SELECT "No. in series" FROM "Table" WHERE "Featured character(s)" = 'Jack & Locke';