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counter for nights
「夜」 has another reading with different meanings.
night; evening
二に夜よる続けつづけて雨あめが降っふった。
It rained for two nights in a row.
三さん夜やも寝ねられなくて辛かっつらかったです。
Not sleeping for three nights was tough.
一夜いちやで雪ゆきがたくさん積もりつもりましたね。
A lot of snow piled up in just one night.