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Thun. 38.6 on Linux. For these who wonder how to launch it it's in Contacts Manager » Tools » Find Duplicates

Finds dupes into a single list or list A and B. Let me choose which of the contacts to keep/delete, one by one or automatically.

Proposal: add some merge helpers (e.g. "Merge these fields", with a bidirectional arrow). Thank you for sharing this module!