o el de las vocales
o el de las vocales ?
o̞ WORD_BOUNDARY e̞ l WORD_BOUNDARY d e̞ WORD_BOUNDARY l a s WORD_BOUNDARY β o̞ k a l e̞ s WORD_BOUNDARY
o WORD_BOUNDARY e l WORD_BOUNDARY d e WORD_BOUNDARY l a s WORD_BOUNDARY v o c a l e s WORD_BOUNDARY ? WORD_BOUNDARY