Câu hỏi khảo sát mẫu

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  1. vvvvvvvv
  2. lllllll
  3. bbbbbb
  4. rrrrrrrrr
  5. ggggggg
  6. bbbbbbbbbbbgggggggggg
  7. 111111
  8. nnnnnnn
  9. ddddddd
  10. fffff