import Control.Monad
import Data.Ord
import Data.List

main = do
 t <- readLn
 replicateM_ t $ do
  getLine
  ls <- map read . words <$> getLine :: IO [Integer]
  print (kadomatsu ls)

kadomatsu = length . unfoldr take3 . sort' . group . sort
 where
  sort' = sortBy (flip (comparing length)) 
  take3 ((_:ls1):(_:ls2):(_:ls3):lss) = Just ((), sort' (ls1:ls2:ls3:lss))
  take3 _ = Nothing