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ISSN 2580-4820.
Available at: &lt;<a href="https://journal.iapa.or.id/pgr/article/view/279" target="_new">https://journal.iapa.or.id/pgr/article/view/279</a>&gt;. Date accessed: 08 june 2026.
doi: <a href="https://doi.org/10.30589/pgr.v4i1.279">https://doi.org/10.30589/pgr.v4i1.279</a>.