D13231123313133313133112323223313231323223313331313231333132213231211   >>    D1323112331313331313311232322331323132322331333131323133313221323121   <<    D13231123313133313133112323223313231323223313331313231333132213231213   >>      D13231123313133313133112323223313231323223313331313231333132213231212   >>