% the consonants that are allowed to precede a syllabic consonant
::consonant:: = p|ph|b|m|t|th|n|l|ch|chh|s|k|kh|g|h

% Move tones to end of word because they break diphthongs
(?P<sw1>[́̀̂̌̍̄̋]+)(?P<sw2>\w+) -> 0 / _\b

% add extra i or e because the i should not be lost as a vowel but is also used to condition the consonant in the map
% the first i is used to distinguish the consonant
% the second vowel is an actual vowel, part of the coda of the syllable
chi -> chii / # _
cheng -> chieng / # _
chek -> chiek / # _
chhi -> chhii / # _
chheng -> chhieng / # _
chhek -> chhiek / # _
si -> sii / # _
seng -> sieng / # _
sek -> siek / # _
ji -> jii / # _

% distinguish syllabic consonants by adding artificial B token
ng -> Bng / # _ #
m -> Bm / # _ #
ng -> Bng / # _ ([́̀̂̌̍̄̋]) #
m -> Bm / # _ ([́̀̂̌̍̄̋]) #

% consonant preceding syllabic consonant
ng -> Bng / (::consonant::) _ #
ng -> Bng / (::consonant::) _ ([́̀̂̌̍̄̋]) #