C112233313331323223313331311331323133313331313231333131232322221   >>    C11223331333132322331333131133132313331333131323133313123232222   <<    C112233313331323223313331311331323133313331313231333131232322223   >>      C112233313331323223313331311331323133313331313231333131232322222   >>