% distinguish syllabic consonants by adding artificial B token
ng -> Bng / # _ #
ńg -> Bńg / # _ #
ǹg -> Bǹg / # _ #
n̂g -> Bn̂g / # _ #

n -> Bn / # _ #
ń -> Bń / # _ #
ǹ -> Bǹ / # _ #
n̂ -> Bn̂ / # _ #

m -> Bm / # _ #
ḿ -> Bḿ / # _ #
m̀ -> Bm̀ / # _ #
m̂ -> Bm̂ / # _ #

% move the PFS tone diacritic to the end because it may split a dipthong
(?P<sw1>[̂̀́̍]+)(?P<sw2>\w+) -> 0 / _\b

y -> i / # _

% add extra i because the i should not be lost as a vowel but is also used to condition the consonant in the map
chi -> chii / # _
chhi -> chhii / # _
si -> sii / # _
ngi -> ngii / # _