consonant_modifiers = CMAbv* CMBlw* ((H B | SUB) VS? CMAbv? CMBlw*)*;
medial_consonants = MPre? MAbv? MBlw? MPst?;
dependent_vowels = VPre* VAbv* VBlw* VPst*;
vowel_modifiers = VMPre* VMAbv* VMBlw* VMPst*;
final_consonants = FAbv* FBlw* FPst* FM?;

virama_terminated_cluster =
  R? (B | GB) VS?
  consonant_modifiers
  H
;

standard_cluster =
  R? (B | GB) VS?
  consonant_modifiers
  medial_consonants
  dependent_vowels
  vowel_modifiers
  final_consonants
;

broken_cluster =
  R?
  consonant_modifiers
  medial_consonants
  dependent_vowels
  vowel_modifiers
  final_consonants
;

number_joiner_terminated_cluster = N VS? (HN N VS?)* HN;
numeral_cluster = N VS? (HN N VS?)*;
symbol_cluster = S VS? SMAbv* SMBlw*;
independent_cluster = (IND | O | WJ) VS?;

main =
    independent_cluster:independent_cluster
  | virama_terminated_cluster:virama_terminated_cluster
  | standard_cluster:standard_cluster
  | number_joiner_terminated_cluster:number_joiner_terminated_cluster
  | numeral_cluster:numeral_cluster
  | symbol_cluster:symbol_cluster
  | broken_cluster:broken_cluster
;