И все таки что то не то...:

[imed3]

                                                                           ∞

                                                                               /\
                                                                              у
                                                                               у
                                                                              у
                                                                              у
                                                                               у
                                                                                у
∞<ссссссссссссссссссссссссссссссссссссссссс ааааааааааааааааааааааааааааааааааааа>∞
                                                                              р
                                                                                р
                                                                                р
                                                                                р             
                                                                                р
                                                                                р
                                                                               V
                                                                               ∞
Так вроде точней.