::vowel:: = a|æ|i|u|e|o|aː|æː|iː|uː|eː|oː|ruː|li|liː

% Virama
V -> 0 / _ ්
් -> 0 / _

% Vowel diacritics
V -> 0 / _ (::vowel::)

% Inherent vowels
V -> a / _