HTIndex: TYPE~HashTypes.HTIndex;
htNull: HTIndex~HashTypes.htNull;
FindString, FindEquivalentString: PROC [ConvertUnsafe.SubString] RETURNS [HTIndex];
EnterString: PROC [ConvertUnsafe.SubString] RETURNS [HTIndex];
SubStringForHash: PROC [HTIndex] RETURNS[ConvertUnsafe.SubString];