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Elaphe flavolineata
Finally, I found the ID of this snake.. This is E. flavolineata, In Indonesia it called Ular Kopi or Sowo Kopi. This snake definitely is not venomous. You can check it from the site, its in Bahasa :)
Great found! I've never seen this before! Maybe you can write some information about this snake, the size, habitat, etc. :)