user: Question: Who constructed Stefan Johansson's car with a grid under 14?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Nigel Mansell', 'Williams - Honda', 75.0, '1:32:58.109', 3.0]
SQL:

assistant: SELECT "Constructor" FROM "Table" WHERE "Grid" < 14.0 AND "Driver" = 'Stefan Johansson';