7 strokes
spine, backbone
On'Yomi: ロ, リョ
Kun'Yomi: せぼね
6 strokes
go-between, relationship
On'Yomi: チュウ
Kun'Yomi: なか
4 strokes
in, inside, middle, mean, center
Kun'Yomi: なか, うち, あた.る