A B C D E F
a b c d e f .
a WORD_BOUNDARY b WORD_BOUNDARY t̠ʃ WORD_BOUNDARY d WORD_BOUNDARY ə WORD_BOUNDARY f WORD_BOUNDARY
a WORD_BOUNDARY b WORD_BOUNDARY c WORD_BOUNDARY d WORD_BOUNDARY e WORD_BOUNDARY f WORD_BOUNDARY . WORD_BOUNDARY