Penyelundupan hukum perjanjian hutang piutang lisan sebagai pendahuluan Akta Perjanjian Pengikatan Jual Beli: Putusan Mahkamah Agung Republik Indonesia Nomor 2288/K/PDT/2020 = Evasion of law in an unwritten debt agreement made as a Preliminary Agreement of a Sales and Purchase Agreement Deed: Supreme Court Decision Number 2288/K/PDT/2020