C11112331312111112111133132313331333133313232213331323133313112331323132222121   >>    C1111233131211111211113313231333133313331323221333132313331311233132313222212   <<    C11112331312111112111133132313331333133313232213331323133313112331323132222123   >>      C11112331312111112111133132313331333133313232213331323133313112331323132222122   >>