static bool eq(object[] a, object[] b) {
if (a == b) return true;
if (a == null || b == null) return false;
if (a.Length != b.Length) return false;
bool alleq = true;
for (int i = 0; i < a.Length; i++)
if (!a[i].Equals(b[i]))
alleq = false;
if (alleq) return true;
ResSet xa = new ResSet(a);
ResSet xb = new ResSet(b);
xa.RetainAll(xb);
return xa.Count == xb.Count;
}
