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Copyright (c) 2018 Widi Wahyudi, Didin Budiman, Endang Saepudin

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This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

This journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge.

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This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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