va s va va de sa du
va s va va de sa du ?
v a WORD_BOUNDARY ɛ s WORD_BOUNDARY v a WORD_BOUNDARY v a WORD_BOUNDARY d eː WORD_BOUNDARY s a WORD_BOUNDARY d ʉ WORD_BOUNDARY
v a WORD_BOUNDARY s WORD_BOUNDARY v a WORD_BOUNDARY v a WORD_BOUNDARY d e WORD_BOUNDARY s a WORD_BOUNDARY d u WORD_BOUNDARY