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Days since each 1on1 collab pair in StarsEN, I didn't count birthday appearances unless they were more than 1 hour alone. Some notes:
>Hakka hasn't collabed with Tempus in over a year besides Shinri
>Shinri has the least amount of 1on1 collabs, same as GB
>Only Hakka and Flayon have had a collab with every member