import gen.*;
import edu.neu.ccs.demeterf.*;

class Magic extends Bc {
  // magically replace apples by oranges and vice versa
  // and keep the rest of the structure the same
//      NumericalField combine(ConstrainedField a){return new NumericalField();}
//      ConstrainedField  combine(NumericalField o){return new ConstrainedField();}
  public static Start magic(Start s){
    return new Traversal(new Magic()).<Start> traverse(s);
  }
}