C12121223131323223313132322331323133313232112323222113313131121   >>    C1212122313132322331313232233132313331323211232322211331313112   <<    C12121223131323223313132322331323133313232112323222113313131123   >>      C12121223131323223313132322331323133313232112323222113313131122   >>