tk B satu kelas tk A satu kelas
tk b satu kelas tk a satu kelas .
t e k a WORD_BOUNDARY b e WORD_BOUNDARY s a t u WORD_BOUNDARY k ɛ l a s WORD_BOUNDARY t e k a WORD_BOUNDARY  a WORD_BOUNDARY s a t u WORD_BOUNDARY k ɛ l a s WORD_BOUNDARY
t k WORD_BOUNDARY b WORD_BOUNDARY s a t u WORD_BOUNDARY k e l a s WORD_BOUNDARY t k WORD_BOUNDARY a WORD_BOUNDARY s a t u WORD_BOUNDARY k e l a s WORD_BOUNDARY