which country has leaders sigurður ingi jóhannsson and guðni th . jóhannesson ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_leader dbr_Sigurður_Ingi_Jóhannsson sep_dot var_uri dbo_leader dbr_Guðni_Th._Jóhannesson sep_dot var_uri a dbo_Country brack_close