nodes = ["uno","dos","tres","cuatro","cinco","seis"]

edges = [("uno", "dos"),
         ("uno", "tres"),
         ("dos", "tres"),
         ("dos", "cuatro"),
         ("tres", "cuatro"),
         ("tres", "cinco"),
         ("cuatro", "cinco"),
         ("cuatro", "seis"),
         ("cinco", "seis")]

inverses =[(j,i) for (i,j) in edges]

arcs = edges + inverses

ArcsOut[i in nodes] = [(i,j) for (i,j) in arcs for i in stations for j in stations].