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I dunno why Moona has this notion that Holo members randomly ask each other for song collabs when that case is very very rare, usually it's just members that are already close or are on good terms with each other. And the few holomems who Moona has formed bonds with are not very musically inclined Holos who don't even put out many solo covers of themselves much less duet covers so it really shouldn't bother her.