human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Name or route, type, elevation groundstation, elevation mountainstation, slope length, capacity in persons/hour, construction year(s)
###Question: Which elevation groundstation has a capacity in persons/hour larger than 820, and a Name or route of lager 1, and a slope length smaller than 336?
gpt
SELECT AVG elevation groundstation FROM table WHERE capacity in persons/hour > 820 AND Name or route = lager 1 AND slope length < 336