PNG  IHDRG*[0PLTE@@@ftRNSS pHYsetEXtTitleInftyEditor MathImageytEXtAuthorAdministrator*'tEXtDescription $ \bm{2}^{\bm{m}}-\bm{1} $(tEXtCopyrightInftyProject@$tEXtCreation Time r'rr'rr IDATx Pˡ(A -li9pɜz1@1jtD$d&+! ̧(IHs>uLlgT󄺝-R7P\g_Y̊3P,蝈" 46/z]Z@fWIENDB`