Example: OCM differs by multiple anonymous nodes

Source OCM                         Destination OCM
A {1,1} (,)                               A {1,1} (,)
     B {1,1} (|)                               0 {1,-1} (,)
          #text                                 0 {0,-1} (|)
     C {1,1} (|)                                    B {1,1) (|)
          #text                                            #text
     D {1,1} (|)                                    C {1,1} (|)
          #text                                            #text
                                                             D {1,1} (|)
                                                               #text

This operation fails because there is more than one anonymous node separating A and B, C, and D.