ach du backst da was
ach du backst da was ?
 a x WORD_BOUNDARY d uː WORD_BOUNDARY b a k s t WORD_BOUNDARY d aː WORD_BOUNDARY v a s WORD_BOUNDARY
a c h WORD_BOUNDARY d u WORD_BOUNDARY b a c k s t WORD_BOUNDARY d a WORD_BOUNDARY w a s WORD_BOUNDARY