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欠 

Stroke count: 4
Meanings: lack, gap, fail
Readings: あくび, か.く, か.ける, ケツ, ケン

Vocab lookup:

Level 2 vocabulary
欠ける	(v1) to be lacking/ (P)
欠陥	(n) defect/ fault/ deficiency/ (P)
欠席	(n,vs) absence/ non-attendance/ (P)
欠点	(n) faults/ defect/ weakness/ (P)
Level 1 vocabulary
欠く	(v5k) to lack/ to break/ to crack/ to chip/ (P)
欠乏	(n) want/ shortage/ famine/ (P)
不可欠	(adj-na,n) indispensable/ essential/ (P)

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