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Susantiningdyah, H.; Inayati, N.; Dirgantari, A. S.; AS, H. C. USING COLLABORATIVE LEARNING APPROACH TO IMPROVE LEARNER’S MENTAL LEXICON OF WORD ASSOCIATION: Received: 27th August 2021; Revised: 07th December 2021, 31st January 2022, 03rd February 2022; Accepted: 04th February 2022. pijtel 2022, 5, 203-219.