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What do the first three wells in the piano score mean?

There are three wells in a key. The one above is a2 on the key. The bottom is F.

Sister, I know you. I can't help it The generation gap is indeed an international problem. Let me tell you something. A friend came to my house. I said "fuck you" to her. My parents call me rude. My grievance! ! ! Don't reason with that grandpa. He won't understand.