original: prometheus acts as a shepherd satellite for the inner edge of saturn 's f ring .
simplifications: prometheus acts as a shepherd satellite for the inner edge of saturn 's f ring . 1 . prometheus acts as a shepherd satellite for the inner edge of saturn 's f ring . prometheus acts as a shepherd satelitte for the inner edge of saturn 's f ring . prometheus acts as a shepherd beacon for the inner edge of saturn 's f ring . prometheus acts as a guard / guide satellite for the inner edge of saturn 's f ring . prometheus acts as a satellite for the inner edge of saturn 's f ring . prometheus acts as a shepherd satellite for the inner edge of saturn 's f ring . prometheus acts as a shepherd satellite for the inner edge of saturn 's f ring .