join | Control.Monad.Writer.Lazy, Control.Monad.Writer, Control.Monad.Writer.Strict, Control.Monad.State.Lazy, Control.Monad.State.Strict, Control.Monad.State, Control.Monad.Reader, Control.Monad.RWS.Lazy, Control.Monad.RWS.Strict, Control.Monad.RWS, Control.Monad.List, Control.Monad.Identity, Control.Monad.Except, Control.Monad.Error, Control.Monad.Cont |