[Haskell-cafe] [Maybe Int] sans Nothings

What's the best way to end up with a list composed of only the Just values,no Nothings? Michael ==========================  import Control.Monad.Stateimport Data.Maybe type GeneratorState = State Int tick :: GeneratorState (Maybe Int)tick = do n <- get          if ((n `mod` 7) == 0)            then              return Nothing            else do              put (n+1)              return (Just n) {-*Main> evalState (sequence $ replicate 9 tick) 1[Just 1,Just 2,Just 3,Just 4,Just 5,Just 6,Nothing,Nothing,Nothing]-}