Heavy, Light, and Neutral Vowels

Vowels in Korean are classified as Yang (positive, light, not heavy), Eum (negative, dark, heavy), and neutral.

The Yang vowels are ㅏ and ㅗ .
The Eum vowels are ㅓ and ㅜ .
The neutral vowels are ㅣ and ㅡ

When combining vowels to make diphthongs:
Yang vowels can only combine with other yang or neutral vowels. (example: ㅘ, ㅚ)
Eum vowels can only combine with other eum or neutral vowels. (examples: ㅝ, ㅟ)
Neutral vowels can only combine with other neutral vowels. (example: ㅢ)

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