ax ax ax ax xob
ax ax ax ax xob ?
a̟ kʰ s WORD_BOUNDARY a̟ kʰ s WORD_BOUNDARY a̟ kʰ s WORD_BOUNDARY a̟ kʰ s WORD_BOUNDARY kʰ s o b WORD_BOUNDARY
a x WORD_BOUNDARY a x WORD_BOUNDARY a x WORD_BOUNDARY a x WORD_BOUNDARY x o b WORD_BOUNDARY ? WORD_BOUNDARY