D121211111111233131333131333132311313231323223313231323233232213221   >>    D12121111111123313133313133313231131323132322331323132323323221322   <<    D121211111111233131333131333132311313231323223313231323233232213223   >>      D121211111111233131333131333132311313231323223313231323233232213222   >>