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This book uses funny story plot to think from the angle of a child. It starts from find younger sister's peepee to solve the questions of the difference between girl and boy and the difference of their reproductive system. All is to bring a relaxing sex education class.
| Media | Books Book |
| Released | October 19, 2018 |
| ISBN13 | 9789864139880 |
| Publishers | ????-???? |
| Pages | 36 |
| Dimensions | 150 × 220 × 20 mm · 204 g (Weight (estimated)) |
| Language | Chinese |
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