code: public Tree transformTree(Tree t) {
      if (VERBOSE) {
        System.err.println("Input to CoordinationTransformer: " + t);
      }
      Tree tx = tn.transformTree(t);
      if (VERBOSE) {
        System.err.println("After DependencyTreeTransformer:  " + tx);
      }
      if (tx == null) {
        return tx;
      }
      Tree tt = UCPtransform(tx);
      if (VERBOSE) {
        System.err.println("After UCPTransformer:             " + t);
      }
      Tree ttt = CCtransform(tt);
      if (VERBOSE) {
        System.err.println("After CCTransformer:              " + t);
      }
      Tree ret = qp.transformTree(ttt);
      if (VERBOSE) {
        System.err.println("After QPTreeTransformer:          " + t);
      }
      return ret;
    }
docs: Transforms t if it contains a coordination in a flat structure (CCtransform)
  and transforms UCP (UCPtransform).
  
  @param t a tree to be transformed
  @return t transformed