Database: car_1
Question: Which distinctive models are produced by maker with the full name General Motors?
SQL: select distinct t2.model from car_names as t1 join model_list as t2 on t1.model  =  t2.model join car_makers as t3 on t2.maker  =  t3.id join cars_data as t4 on t1.makeid  =  t4.id where t3.fullname  =  "general motors"