beltza beltza beltza
beltza beltza beltza .
b e l t̪̻s̪̻ a WORD_BOUNDARY β e l t̪̻s̪̻ a WORD_BOUNDARY β e l t̪̻s̪̻ a WORD_BOUNDARY
b e l t z a WORD_BOUNDARY b e l t z a WORD_BOUNDARY b e l t z a WORD_BOUNDARY . WORD_BOUNDARY