va volando volando
va vola
co part
va volando volando .
β a WORD_BOUNDARY β o̞ l a n d o̞ WORD_BOUNDARY β o̞ l a n d o̞ WORD_BOUNDARY
v a WORD_BOUNDARY v o l a n d o WORD_BOUNDARY v o l a n d o WORD_BOUNDARY . WORD_BOUNDARY