Batak plugin for Multiling O Keyboard. This is not an independent app, please install OKeyboard along with this plugin.

Instruction:
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⑴ Install this plugin and Multiling O Keyboard.
⑵ Run O Keyboard and follow its setup guide.
⑶ Slide space bar to switch languages.

Please email if you have any questions.

Wikipedia:

The Batak languages are spoken by Batak of North Sumatra, Indonesia.

Historically they were written using Batak script but the Latin script is now used for most writing.

There are considered two main Batak language groups, Northern Batak and Southern Batak. Simalungun has been considered an intermediary, but more recent studied suggest that it is a part of the Southern Batak group.[2] Within Northern Batak, a study noted 76% cognate words between Karo and Batak, 81% with Pakpak, and 80% with Simalungun, and 30% with Malay (Indonesian).[3] Karo and Toba Batak are mutually unintelligible.

Northern Batak: Pak-Pak Dairi, Karo
Southern Batak (Tobaic): Simalungun, Angkola–Batak Mandailing, Batak Toba
Mandailing and Angkola are closer related to each other than to Toba. The geographical influences on the Batak languages can be seen in the map to the right; Lake Toba separates the Karo from direct contact with the Toba.

Tips:
This app is useful for exotic tattoo design.
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Photo: Guardian Lake by Romain Guy