D1122211211331313331323221123313233313112211232233131333132313331323133312121   >>    D112221121133131333132322112331323331311221123223313133313231333132313331212   <<    D1122211211331313331323221123313233313112211232233131333132313331323133312123   >>      D1122211211331313331323221123313233313112211232233131333132313331323133312122   >>