D212213231311233131313331322331311331313232233132322121211113313231232313121   >>    D21221323131123313131333132233131133131323223313232212121111331323123231312   <<    D212213231311233131313331322331311331313232233132322121211113313231232313123   >>      D212213231311233131313331322331311331313232233132322121211113313231232313122   >>