Grundplan

                                                                                                                        A1

                                                                                                                        A2

                                                                                                                        A3

                                                                                                                        B1

                                                                                                                        B2               

                                                                                                                         B3  

                                                                                                                        C1

                                                                                                                           C2

                                                                                                                            C3