cau 'o cau 'r drws
cau 'o cau 'r drws .
k aɨ WORD_BOUNDARY  oː WORD_BOUNDARY k aɨ WORD_BOUNDARY ɛ r WORD_BOUNDARY d r uː s WORD_BOUNDARY
c a u WORD_BOUNDARY ' o WORD_BOUNDARY c a u WORD_BOUNDARY ' r WORD_BOUNDARY d r w s WORD_BOUNDARY