% Move tones to end of word
(?P<sw1>[˩˨˧˦˥]+)(?P<sw2>\w+) -> 0 / _\b

% ends in p,t,k (does not have a tone diacritic) - 5th tone
0 -> ˨ / [ptk] _ #

% the following 2 rules rely on the tone already being moved to the end of the word
% if no tone diacritic, it's the 4th tone
0 -> ˥ / ([^˩˨˧˦˥]) _ #