A swimming event of four strokes that are swum in a specified order – fly, back, breast, and free.
In an IM, all four of the competitive strokes are swum by one swimmer in the following order: butterfly, backstroke, breaststroke, then freestyle.
In individual medley events, the swimmer must swim all four main strokes in the following order: Butterfly, Backstroke, Breaststroke, Freestyle. Each section must be finished in accordance with the rules for the stroke concerned.
Event where the swimmer shall swim the prescribed distance and strokes in the following order: butterfly, backstroke, breaststroke, freestyle.
A swimming event using all 4 of the competitive strokes on consecutive lengths of the race. The order must be: Butterfly, Backstroke, Breaststroke, Freestyle. Equal distances must be swum of each stroke. Distances offered: 100 yds, 200 yds/mtr, 400 yds/mtr.