Perlindungan Hak dan Kepastian Hukum bagi Pemegang Sertipikat Hak Atas Tanah yang Sebenarnya Terkait Sertipikat Ganda (Studi Putusan Mahkamah Agung Nomor 1693 K/Pdt/2018) = Protection of Rights and Legal Certainty for Holders of Certificates of Land Rights that are Actually Related to Dual Certificates (Study of Supreme Court Decision Number 1693 K/Pdt/2018)