Database: car_1
Question: What are the different models wthat are lighter than 3500?
SQL: select distinct t1.model from model_list as t1 join car_names as t2 on t1.model  =  t2.model join cars_data as t3 on t2.makeid  =  t3.id join car_makers as t4 on t1.maker  =  t4.id where t3.weight  <  3500