C111123313331323113313331333133313331323133112113313113313123311   >>    C11112331333132311331333133313331333132313311211331311331312331   <<    C111123313331323113313331333133313331323133112113313113313123313   >>      C111123313331323113313331333133313331323133112113313113313123312   >>