D1212121212131323131133132311233132313231323221333132333132333132211211   >>    D121212121213132313113313231123313231323132322133313233313233313221121   <<    D1212121212131323131133132311233132313231323221333132333132333132211213   >>      D1212121212131323131133132311233132313231323221333132333132333132211212   >>