C111123313331323113313331333133313331323133112113313232212111111111121123311   >>    C11112331333132311331333133313331333132313311211331323221211111111112112331   <<    C111123313331323113313331333133313331323133112113313232212111111111121123313   >>      C111123313331323113313331333133313331323133112113313232212111111111121123312   >>