public void TestMissingStart01() {
var productions = new List<Production> {
CFGParser.Production(@"<X_0> -> <X_0> <X_0>"),
CFGParser.Production(@"<X_0> -> 'a'"),
};
Grammar g = new Grammar(productions, Nonterminal.Of("S"));
CNFGrammar h = g.ToCNF();
}