National flag-raising and national oath-taking ceremony takes place to mark 77th founding anniversary of DPRKNational flag-raising and national oath-taking ceremony takes place to mark 77th founding anniversary of DPRKNational flag-raising and national oath-taking ceremony takes place to mark 77th founding anniversary of DPRKNational flag-raising and national oath-taking ceremony takes place to mark 77th founding anniversary of DPRKNational flag-raising and national oath-taking ceremony takes place to mark 77th founding anniversary of DPRKNational flag-raising and national oath-taking ceremony takes place to mark 77th founding anniversary of DPRKNational flag-raising and national oath-taking ceremony takes place to mark 77th founding anniversary of DPRKNational flag-raising and national oath-taking ceremony takes place to mark 77th founding anniversary of DPRKNational flag-raising and national oath-taking ceremony takes place to mark 77th founding anniversary of DPRKNational flag-raising and national oath-taking ceremony takes place to mark 77th founding anniversary of DPRKNational flag-raising and national oath-taking ceremony takes place to mark 77th founding anniversary of DPRK