e eh eh eh heh
e eh eh eh heh .
e WORD_BOUNDARY  ɛ h WORD_BOUNDARY ɛ h WORD_BOUNDARY ɛ h WORD_BOUNDARY h ɛ h WORD_BOUNDARY
e WORD_BOUNDARY e h WORD_BOUNDARY e h WORD_BOUNDARY e h WORD_BOUNDARY h e h WORD_BOUNDARY