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Oracle Bone ~1250-1000 BC 
Oracle Bone ~1250-1000 BC 
Bronze Mid Western Zhou ~900 BC 
Seal Warring States (Chu) 475-221 BC 
Seal Shuowen ~100 AD 
Clerical Qin 221-206 BC 
Clerical Western Han 202 BC-9 AD 
Clerical Western Han 202 BC-9 AD 
Clerical Eastern Han 25-220 AD 
Clerical Eastern Han 25-220 AD Regular Modern
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說文解字
《說文》：“內，入也。从口，自外而入也。”
Sources
- Readings & variants
- Unicode
- Historical images
- Academia Sinica
- Etymology
- Shuowen Jiezi (說文解字)