he+em tumpuk ditumpuk
he em tumpuk ditumpuk !
h ɛ WORD_BOUNDARY  ɛ m WORD_BOUNDARY t u m p u k WORD_BOUNDARY d i t u m p u k WORD_BOUNDARY
h e WORD_BOUNDARY e m WORD_BOUNDARY t u m p u k WORD_BOUNDARY d i t u m p u k WORD_BOUNDARY