C111123313331323113313331333133313331323132311331323223313232211   >>    C11112331333132311331333133313331333132313231133132322331323221   <<    C111123313331323113313331333133313331323132311331323223313232213   >>      C111123313331323113313331333133313331323132311331323223313232212   >>