LDK
http://www.freedom.co.jp/architects/middle/%E6%86%A9%E3%81%84%E3%81%AE%E5%A0%B4%E3%81%8C%E3%81%82%E3%82%8B%EF%BD%93%EF%BD%8F%EF%BD%88%EF%BD%8F.html