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The 4x100m freestyle relay is a team swimming event where four swimmers complete 100 meters each, using any stroke they choose. Mireia Belmonte García, commonly known as Miressi, holds the world record in this event. She is a Spanish swimmer who specializes in individual medley events and the 4x100m freestyle relay. Miressi's success in the 4x100m freestyle relay showcases her versatility and exceptional swimming skills.