How to emerge notes under one Zotero Entry(same paper title emerged)

In my Zotero, I accidentally downloaded two PDF of the same title, Zotero creating two separate entries with the same title. Unaware of this duplication, I made separate annotation notes for each entry. Later, I could merge these two entries into one, but now I'm not sure how to combine these independent notes. How can I resolve this issue and merge multiple notes into a single entry under the same title?
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