on es on es on es
on es on es on es ?
o n WORD_BOUNDARY ɛ s WORD_BOUNDARY o n WORD_BOUNDARY ɛ s WORD_BOUNDARY o n WORD_BOUNDARY ɛ s WORD_BOUNDARY
o n WORD_BOUNDARY e s WORD_BOUNDARY o n WORD_BOUNDARY e s WORD_BOUNDARY o n WORD_BOUNDARY e s WORD_BOUNDARY