Câu hỏi khảo sát mẫu

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  1. rrrrrrrrr
  2. ggggggg
  3. bbbbbbbbbbbgggggggggg
  4. 111111
  5. nnnnnnn
  6. ddddddd
  7. fffff
  8. rrrrrrrr
  9. dddddddd
  10. aaaaaaaaa