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%YAML 1.1 --- !!map { ? !!str "sequence" : !!seq [ !!str "one", !!str "two" ], ? !!str "mapping" : !!map { ? !!str "sky" : !!str "blue", # ? !!str "sea" : !!str "green", ? !!map { ? !!str "sea" : !!str "green" } : !!null "", } }