You would do a backstroke flip turn in the 50 meter portion of
backstroke, a freestyle flip turn in the 50 meter portion of
freestyle, Also regular butterfly and breaststroke turns in their
50 meter portions.
You also need to know how to do transitional turns from
butterfly to backstroke, backstroke to breaststroke, and
breaststroke to freestyle.
Remember also make sure and do two-hand touches on all
breaststroke and butterfly turns and finishes.