D1212121212131323223313233231323133313231323331311331323321131111   >>    D121212121213132322331323323132313331323132333131133132332113111   <<    D1212121212131323223313233231323133313231323331311331323321131113   >>      D1212121212131323223313233231323133313231323331311331323321131112   >>