D1212121221323132313232332313232233131133131323223313233313232121   >>    D121212122132313231323233231323223313113313132322331323331323212   <<    D1212121221323132313232332313232233131133131323223313233313232123   >>      D1212121221323132313232332313232233131133131323223313233313232122   >>