human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Rank, Island's Name, Area (sqmi), Area (km 2 ), Location, Population (2000)
###Question: What is the largest area in Alaska with a population of 39 and rank over 19?
gpt
SELECT MAX Area (km 2 ) FROM table WHERE Location = alaska AND Population (2000) = 39 AND Rank > 19