/// <summary>
/// A word is called short if it ends in a short syllable, and if R1 is null.
/// </summary>
/// <returns></returns>
internal bool IsShortWord()
{
//about to use R1
CheckCache();
//A word is called short if it ends in a short syllable, and if R1 is null.
int lastVowelIndex = Stem.LastIndexOfAny(Vowels);
return(lastVowelIndex > -1 &&
IsShortSyllable(lastVowelIndex) &&
String.IsNullOrEmpty(GetR1()));
}