Quay lén cá__p ___i h_n nhau sá_ soá__n vùng kín ngoài ___

Quay l&eacute_n c&aacute_&ordm_&middot_p &Auml_&lsquo_&ocirc_i h&ocirc_n nhau s&aacute_&raquo_ so&aacute_&ordm_&iexcl_n v&ugrave_ng k&iacute_n ngo&agrave_i &Auml_&lsquo_&AElig_&deg_