public TreeClassDef(RankedAlphabetSort ras, Z3Provider z3p)
{
this.alphabet = ras;
this.z3p = z3p;
this.trees = new Dictionary<string, IEnumerable<Expr>>();
this.acceptors = new Dictionary<string, TreeTransducer>();
this.transducers = new Dictionary<string, TreeTransducer>();
}