oh he+eh he+eh
oh he eh he eh .
o h WORD_BOUNDARY h ɛ WORD_BOUNDARY  ɛ h WORD_BOUNDARY h ɛ WORD_BOUNDARY  ɛ h WORD_BOUNDARY
o h WORD_BOUNDARY h e WORD_BOUNDARY e h WORD_BOUNDARY h e WORD_BOUNDARY e h WORD_BOUNDARY