7A7A - 空
Meaning: sky, to become free, empty
Onyomi: KUU
Kunyomi: sora, a(keru), kara
Strokes: 8 (click on the pic to start the video)
Vocabulary:
空 – sora – sky
空く – aku – to become vacant
空港 – kuukou – airport
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NIHONGO ICHIBAN 
ao sora no namida…