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counter for leaves, pieces of paper, etc.
「葉」 has another reading with different meanings.
紅葉を見に行きませんか。
Would you like to go see the autumn leaves?
落葉が道に積もっている。
Fallen leaves have piled up on the road.
針葉樹と広葉樹の違いは何?
What's the difference between coniferous and deciduous trees?