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DOI : https://doi.org/10.31539/spej.v1i2.271
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DOI : https://doi.org/10.31539/spej.v1i2.268
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DOI : https://doi.org/10.31539/spej.v1i2.269
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DOI : https://doi.org/10.31539/spej.v1i2.272
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DOI : https://doi.org/10.31539/spej.v1i2.255
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