I have updated existing Tango decks to the new Migaku Japanese format. I will probably upload the N3 deck soon. Enjoy.
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RE: Can't import all cards: 706 out of 3812 Cards imported.
@anon-282 It only imports the "known"/"seen" status... so if you haven't reviewed the cards yet, they won't be imported. If you have reviewed all the cards in the deck, it should import the ones you've passed at least 4 times (card interval above 21 days) as "known" and the others as "seen".