adi a+di a+di a+di
adi a di a di a di .
a ð i WORD_BOUNDARY a WORD_BOUNDARY ð i WORD_BOUNDARY a WORD_BOUNDARY ð i WORD_BOUNDARY a WORD_BOUNDARY ð i WORD_BOUNDARY
a d i WORD_BOUNDARY a WORD_BOUNDARY d i WORD_BOUNDARY a WORD_BOUNDARY d i WORD_BOUNDARY a WORD_BOUNDARY d i WORD_BOUNDARY . WORD_BOUNDARY