i+ba i+bo+i+a
i ba i bo i a .
i WORD_BOUNDARY β a WORD_BOUNDARY i WORD_BOUNDARY β o WORD_BOUNDARY i WORD_BOUNDARY a WORD_BOUNDARY
i WORD_BOUNDARY b a WORD_BOUNDARY i WORD_BOUNDARY b o WORD_BOUNDARY i WORD_BOUNDARY a WORD_BOUNDARY . WORD_BOUNDARY