eh ben eh ben eh ben
eh ben eh ben eh ben
co co co co co co
eh ben eh ben eh ben .
ɛ WORD_BOUNDARY b ɛ n WORD_BOUNDARY ɛ WORD_BOUNDARY b ɛ n WORD_BOUNDARY ɛ WORD_BOUNDARY b ɛ n WORD_BOUNDARY
e h WORD_BOUNDARY b e n WORD_BOUNDARY e h WORD_BOUNDARY b e n WORD_BOUNDARY e h WORD_BOUNDARY b e n WORD_BOUNDARY