hat der A+A gemacht
hat der a a gemacht ?
h a t WORD_BOUNDARY d ɛ ɾ WORD_BOUNDARY  ɑː WORD_BOUNDARY  ɑː WORD_BOUNDARY ɡ ə m a x t WORD_BOUNDARY
h a t WORD_BOUNDARY d e r WORD_BOUNDARY a WORD_BOUNDARY a WORD_BOUNDARY g e m a c h t WORD_BOUNDARY