des rivières des vallées
de rivière de vallée
prep n prep n
des rivières des vallées .
d e WORD_BOUNDARY ʁ i v j ɛ ʁ WORD_BOUNDARY d e WORD_BOUNDARY v a l e WORD_BOUNDARY
d e s WORD_BOUNDARY r i v i è r e s WORD_BOUNDARY d e s WORD_BOUNDARY v a l l é e s WORD_BOUNDARY