'' document-start-token() block-mapping-start-token() '?' scalar-token(plain=#t, style=#f, value="hr") ':' block-sequence-start-token() block-entry-token() scalar-token(plain=#t, style=#f, value="Mark McGwire") block-entry-token() anchor-token(value="SS") scalar-token(plain=#t, style=#f, value="Sammy Sosa") block-end-token() '?' scalar-token(plain=#t, style=#f, value="rbi") ':' block-sequence-start-token() block-entry-token() alias-token(value="SS") block-entry-token() scalar-token(plain=#t, style=#f, value="Ken Griffey") block-end-token() block-end-token() ''