<prompt> Ka morago o ile a ba mofofiši wa poso ya difofane ka May 21, 1920.  <response>: Ee, phetolelo e raraganego kudu ya polelo ke e rego Ka morago o ile a ba mofofiši wa poso ya difofane ka 1920 gomme a tšwela pele ka seo go ba go fihla ka August 31, 1927. 