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Playlist Song Connection
Medium
A music platform organizes songs into playlists. Each playlist contains a set of distinct song IDs, and a song may appear in multiple playlists. Two songs are considered "connected" if they share at least one playlist. Connection is transitive: if song A and song B share a playlist, and song B and song C share a playlist, then A and C are connected even if they never appear together in the same playlist.
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