user: Question: How much Area (km 2) has a Common of collegno, and a Population smaller than 50137?
Columns: ['Rank', 'Common of', 'Population', 'Area (km 2 )', 'Density (inhabitants/km 2 )', 'Altitude (mslm)']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1st', 'Torino', 907563.0, 130.7, 6943.9, 239.0]
SQL:

assistant: SELECT "Area (km 2 )" FROM "Table" WHERE "Common of" = 'collegno' AND "Population" < 50137.0;