Hanunuo

https://www.everyculture.com/East-Southeast-Asia/Hanun-o.html
The 7,000 Hanunóo (Bulalakao, Hampangan, Hanono-o, Mangyan) live in an area of 800 square kilometers at the southern end of Mindoro Island (12°30′ N, 121°10′ E), in the Philippines. They speak an Austronesian language, and most are literate, using an Indic-derived script that they write on bamboo. The Hanunóo were largely out of contact with schools and missions at least as late as the early 1950s. They trade with coastal Filipinos for metal, European-made glass beads, and salt, and they act as wholesalers for their interior neighbors, the Buhid, who supply the Hanunóo with clay pottery.