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Abdul Basit; Didit Yulian Kasdriyanto; Deka Matsusitha; Dewi Sindy Anggila; Widya Trisna Rahayuningdiah. Viber Is a Powerful Kick to Support Online Learning During the Covid Period at SDIT Permata Kota Probolinggo. gandrung 2022, 3, 556-562.