mapping-node(flow-style=#f, tag="tag:yaml.org,2002:set", value=((scalar-node(style=#f, tag="tag:yaml.org,2002:str", value="Mark McGwire") . scalar-node(style=#f, tag="tag:yaml.org,2002:null", value="")) (scalar-node(style=#f, tag="tag:yaml.org,2002:str", value="Sammy Sosa") . scalar-node(style=#f, tag="tag:yaml.org,2002:null", value="")) (scalar-node(style=#f, tag="tag:yaml.org,2002:str", value="Ken Griff") . scalar-node(style=#f, tag="tag:yaml.org,2002:null", value=""))))