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%YAML 1.1 --- !!seq [ !!map { ? !!str "explicit key1" : !!str "explicit value", }, !!map { ? !!str "explicit key2" : !!null "", }, !!map { ? !!str "explicit key3" : !!null "", }, !!map { ? !!str "simple key1" : !!str "explicit value", }, !!map { ? !!str "simple key2" : !!null "", }, ]