D1212111111222331313331313231212111113231323223313221323132313232211   >>    D121211111122233131333131323121211111323132322331322132313231323221   <<    D1212111111222331313331313231212111113231323223313221323132313232213   >>      D1212111111222331313331313231212111113231323223313221323132313232212   >>