abuuuuu abuuuu abuuuu buuuuu buuuuu
abuuuuu abuuuu abuuuu buuuuu buuuuu .
a b uː uː u WORD_BOUNDARY a b uː uː WORD_BOUNDARY a b uː uː WORD_BOUNDARY p uː uː u WORD_BOUNDARY p uː uː u WORD_BOUNDARY
a b u u u u u WORD_BOUNDARY a b u u u u WORD_BOUNDARY a b u u u u WORD_BOUNDARY b u u u u u WORD_BOUNDARY b u u u u u WORD_BOUNDARY