+-----------------------+                                                                                                                                                                      
                                  +                       +                                                                                                                                                                      
                                  +                       +                                                                                                                                                                      
                                  +                       +                                                                                                                                                                      
                                  +                       +                                                                                                                                                                      
                                  +         r1            +                                                                                                                                                                      
                                  +      (LMB_NOMAP)      +                                                                                                                                                                      
                                  +                       +                                                                                                                                                                      
                                  +                       +                                                                                                                                                                      
                                  +---------------------- +                                                                                                                                                                      
                                  +                       +   
                                  +                       +                                                                                                                                                                     
                                  +         r3            +
                                  +     (LMB_NONE)        +                                                                                                                                                                       
                                  +---------------------- +                                                                                                                                                                      
                                  +                       +                                                                                                                                                                      
                                  +                       +                                                                                                                                                                      
                                  +        r2             +                                                                                                                                                                      
                                  +     (LMB_NONE)        +                                                                                                                                                                      
                                  +                       +                                                                                                                                                                      
                                  +---------------------- +