public void STExploreTest1()
{
IContext<FuncDecl, Expr, Sort> solver = new Microsoft.Automata.Z3.Z3Provider(BitWidth.BV7);
var st = MkDecodeST(solver, solver.CharSort).ExploreBools();
var stst = st.Compose(st).ExploreBools();
//st.ShowGraph();
//stst.ShowGraph();
var stst_simpl = stst.ToSTb().Simplify();
//var sfa = st1.ToSFA().Minimize().NormalizeLabels();
//sfa.ShowGraph(20);
var w = stst.Diff(stst_simpl.ToST());
Assert.IsNotNull(w);
}