Pesach

Why do we say in Avadim Hayinu that we were slaves "liparoh bimitzraim"(to Pharaoh in Egypt)? Why not just say we were slaves "to Pharaoh" and we would know that it was in Egypt? Also why do we say it twice? Even if we needed it the first time, we don't need to say again two lines later that Pharaoh was in Egypt?