Table: f1_1974_season
Columns: constructor
chassis
engine
tyre
driver
rounds

Question: When the engine Ford Cosworth DFV 3.0 v8 has a chassis of m23 and in rounds 14-15, what is its Tyre?
SQL: SELECT "tyre" FROM f1_1974_season WHERE "rounds" = '14-15' AND "engine" = 'ford cosworth dfv 3.0 v8' AND "chassis" = 'm23'

Question: Which driver uses the ts16 chassis?
SQL: SELECT "driver" FROM f1_1974_season WHERE "chassis" = 'ts16'