D12132323131323132313331322132313233313231311213232233132322221   >>    D1213232313132313231333132213231323331323131121323223313232222   <<    D12132323131323132313331322132313233313231311213232233132322223   >>      D12132323131323132313331322132313233313231311213232233132322222   >>