Vol. 22 No. 1 (2020)

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https://doi.org/10.24252/jumdpi.v22i1.15482
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https://doi.org/10.24252/jumdpi.v22i1.6347
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https://doi.org/10.24252/jumdpi.v22i1.11602
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https://doi.org/10.24252/jumdpi.v22i1.15534
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https://doi.org/10.24252/jumdpi.v22i1.15546
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