https://www.youtube.com/shorts/QjyrqZeRNb8?feature=share 1. 포핸드 1 + 포핸드 1 + 포핸드 1 2. 포핸드 1 + 백핸드 1 전환 3. 백핸드 1 + 돌아서 포핸드 1 + 포핸드 1
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