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Anisa, U.I. and Kartini, K. 2023. Analysis of Student Errors in Solving Relation and Function Problems Based on Kastolan Error Theory Class VIII SMP IT Bangkinang. Edumatica : Jurnal Pendidikan Matematika. 13, 02 (Sep. 2023), 172-180. DOI:https://doi.org/10.22437/edumatica.v13i02.19473.