D13231123313133313133112323223313231323223313331313233313221231   >>    D1323112331313331313311232322331323132322331333131323331322123   <<    D13231123313133313133112323223313231323223313331313233313221233   >>      D13231123313133313133112323223313231323223313331313233313221232   >>