user: Question: What is the largest area in alaska with a population of 39 and rank over 19?
Columns: ['Rank', "Island's Name", 'Area (sqmi)', 'Area (km 2 )', 'Location', 'Population (2000)']
Types: ['real', 'text', 'real', 'real', 'text', 'text']
Sample row: [1.0, 'Hawai ʻ i (Big Island)', 4028.0, 10433.0, 'Hawaii', '148,677']
SQL:

assistant: SELECT MAX("Area (km 2 )") FROM "Table" WHERE "Location" = 'alaska' AND "Population (2000)" = '39' AND "Rank" > 19.0;