he+eh ada sofa sofa
he eh ada sofa sofa .
h ɛ WORD_BOUNDARY  ɛ h WORD_BOUNDARY a d a WORD_BOUNDARY s o f a WORD_BOUNDARY s o f a WORD_BOUNDARY
h e WORD_BOUNDARY e h WORD_BOUNDARY a d a WORD_BOUNDARY s o f a WORD_BOUNDARY s o f a WORD_BOUNDARY