user: Question: When did channel 83 in Singapore launch?
Columns: ['Territory', 'Broadcaster', 'Channel', 'Launched', 'Closed']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['Brunei', 'Kristal-Astro', 121.0, 'August 31, 2006', 'February 1, 2010']
SQL:

assistant: SELECT "Launched" FROM "Table" WHERE "Territory" = 'Singapore' AND "Channel" = 83.0;