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Matches in DBpedia 2014 for { ?s ?p The world record in the 4×100 metres medley swimming relay was first recognised in 1953![citation needed] by FINA, with world swimming governing body. Initially world records were only recognised in long course swimming pools which were a minimum of 50 metres in length – some of the early records were achieved in pools measuring 55 yards (50.29 m).[citation needed] Records set in a Short course (25 m) pool have been recognised since 3 March 1991.[citation needed]The medley relay consists of 4 competitors swimming consecutively with each swimmer performing a different stroke: Backstroke (this can only be the first stroke, due to the necessity of starting this leg in the pool rather than by diving in) Breaststroke Butterfly Freestyle, (with the limitation that freestyle means any style other than backstroke, breaststroke or butterfly – most swimmers use the front crawl)It is possible to set a world record in the 100 m backstroke through performance by the first swimmer of the relay team. Performances in the other legs cannot qualify as world records as FINA criteria requires a static start – swimming relay takeovers are often dynamic.The event has been a fixture of the Olympic swimming programme since 1960.. }

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