Kekuatan Hukum Sertipikat Tanah Ulayat Milik Masyarakat Adat yang Diklaim Penguasaannya oleh Subjek Hukum Perorangan di Desa Timpag, Kabupaten Tabanan Bali = Legal Stregth of Communal Land Certificate Owned by Indigenious Communities that Claimed by Individual Legal Subject in Timpag Village, Tabanan Regency, Bali