public static State <S, Stck <A> > sequence <S, A>(Stck <State <S, A> > ma) =>
 SeqStateExtensions.SequenceFast(ma).Map(toStack);
 public static State <S, IEnumerable <A> > sequence <S, A>(IEnumerable <State <S, A> > ma) =>
 SeqStateExtensions.SequenceFast(ma).Map(Enumerable.AsEnumerable);
 public static State <S, HashSet <A> > sequence <S, A>(HashSet <State <S, A> > ma) =>
 SeqStateExtensions.SequenceFast(ma).Map(toHashSet);
 public static State <S, A[]> sequence <S, A>(State <S, A>[] ma) =>
 SeqStateExtensions.SequenceFast(ma).Map(x => x.ToArray());
 public static State <S, Arr <A> > sequence <S, A>(Arr <State <S, A> > ma) =>
 SeqStateExtensions.SequenceFast(ma).Map(toArray);
 public static State <S, Lst <A> > sequence <S, A>(Lst <State <S, A> > ma) =>
 SeqStateExtensions.SequenceFast(ma).Map(toList);
 public static State <S, Seq <A> > sequence <S, A>(Seq <State <S, A> > ma) =>
 SeqStateExtensions.SequenceFast(ma).Map(Prelude.Seq);