'' block-mapping-start-token() '?' scalar-token(plain=#t, style=#f, value="american") ':' block-sequence-start-token() block-entry-token() scalar-token(plain=#t, style=#f, value="Boston Red Sox") block-entry-token() scalar-token(plain=#t, style=#f, value="Detroit Tigers") block-entry-token() scalar-token(plain=#t, style=#f, value="New York Yankees") block-end-token() '?' scalar-token(plain=#t, style=#f, value="national") ':' block-sequence-start-token() block-entry-token() scalar-token(plain=#t, style=#f, value="New York Mets") block-entry-token() scalar-token(plain=#t, style=#f, value="Chicago Cubs") block-entry-token() scalar-token(plain=#t, style=#f, value="Atlanta Braves") block-end-token() block-end-token() ''