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            https://doi.org/10.24114/jip.v2i1.26869
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            https://doi.org/10.24114/jip.v2i1.26869
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 DOI :
            
            https://doi.org/10.24114/jip.v2i1.28232
             DOI :
            
            https://doi.org/10.24114/jip.v2i1.27010
 DOI :
            
            https://doi.org/10.24114/jip.v2i1.27010
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            https://doi.org/10.24114/jip.v2i1.28325
 DOI :
            
            https://doi.org/10.24114/jip.v2i1.28325
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            https://doi.org/10.24114/jip.v2i1.30414
 DOI :
            
            https://doi.org/10.24114/jip.v2i1.30414
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