D112221121133131333132322112331323331311221123223313133313233312121   >>    D11222112113313133313232211233132333131122112322331313331323331212   <<    D112221121133131333132322112331323331311221123223313133313233312123   >>      D112221121133131333132322112331323331311221123223313133313233312122   >>