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+STR +DOC +MAP =VAL :sequence +SEQ <tag:yaml.org,2002:seq> =VAL :entry +SEQ <tag:yaml.org,2002:seq> =VAL :nested -SEQ -SEQ =VAL :mapping +MAP <tag:yaml.org,2002:map> =VAL :foo =VAL :bar -MAP -MAP -DOC -STR