public virtual IList<string[]> GetAltLookaheadAsStringLists(IntervalSet[] altLookSets) { IList<string[]> altLook = new List<string[]>(); foreach (IntervalSet s in altLookSets) { altLook.Add(factory.GetTarget().GetTokenTypesAsTargetLabels(factory.GetGrammar(), s.ToArray())); } return altLook; }