doudou S doudou Sa
doudou Sa
n n:prop
doudou s doudou sa .
d u d u WORD_BOUNDARY  ɛ s WORD_BOUNDARY d u d u WORD_BOUNDARY s a WORD_BOUNDARY
d o u d o u WORD_BOUNDARY s WORD_BOUNDARY d o u d o u WORD_BOUNDARY s a WORD_BOUNDARY