user: Question: Which champion has a Group Stage LLWS in Russellville?
Columns: ['Year', 'Champion', 'City', 'LLWS', 'Record']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2001.0, 'Brownsburg LL', 'Brownsburg', 'US Semifinal', '3–1']
SQL:

assistant: SELECT "Champion" FROM "Table" WHERE "LLWS" = 'Group Stage' AND "City" = 'Russellville';