{
   TCanvas *cl = new TCanvas("cl","cl",10,10,700,500);
   TLatex Tl; Tl.SetTextFont(43); Tl.SetTextSize(20);
   Double_t dy = 1./7.;
   Tl.DrawText(.1, dy,   "x^{2y} :");    Tl.DrawLatex(.5, dy,   "x^{2y}");
   Tl.DrawText(.1, 2*dy, "x_{2y} :");    Tl.DrawLatex(.5, 2*dy, "x_{2y}");
   Tl.DrawText(.1, 3*dy, "x^{y^{2}} :"); Tl.DrawLatex(.5, 3*dy, "x^{y^{2}}");
   Tl.DrawText(.1, 4*dy, "x^{y_{1}} :"); Tl.DrawLatex(.5, 4*dy, "x^{y_{1}}");
   Tl.DrawText(.1, 5*dy, "x^{y}_{1} :"); Tl.DrawLatex(.5, 5*dy, "x^{y}_{1}");
   Tl.DrawText(.1, 6*dy, "x_{1}^{y} :"); Tl.DrawLatex(.5, 6*dy, "x_{1}^{y}");
}