YW             YUQQQY
                      UQY            YQOOONQ
                    YSOOWY          YQOONNOWY
                    SONNNSW        YQOONNOUY
                    QNNNNOWY      YQONNNOQY
                    YONNNNOUY    WONNNNNS
                      NNNNNOUY YWONNNNNS
                       ONNNNNSYUQNNNNNY
                        SNNNNNQNNNNNOW
                         SLLNNNNNNNNQY
                 Pro      NLLLNNNNNQY  y
                         UNLLNNNNNQY
                       YQNNNNNNNLLS
                      YQNNNNNLLLLLNO
                    YQNLNNNNLLLJLNNNY
                   ULLLLNNLNWWLLLLNLOW
                 WLLLLLLNLNY USLLLLLLNY
               YOLLJLLLLLS     SLJLLLLO
              WLLJLLLLLNW      YNLJJLLLU
            WQLLLLLLLLQY        YJJJJJLLY
           UQOLLLLLOSY           YNJJJJLNY
               YWWY                QLJJLNY
                                     Y node1