user: Question: what project was initially started before September 20, 1968
Columns: ['#', 'Project', 'Shipyard', 'Laid down', 'Launched', 'Commissioned', 'Status']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['K-137', '667A, 667AU', 'SEVMASH, Severodvinsk', 'November 4, 1964', 'September 11, 1966', 'November 6, 1967', 'Decommissioned April 3, 1994 for scrapping']
SQL:

assistant: SELECT "Commissioned" FROM "Table" WHERE "Launched" = 'September 20, 1968';