C11112331312111112111133133313231333133313331321123232213112121   >>    C1111233131211111211113313331323133313331333132112323221311212   <<    C11112331312111112111133133313231333133313331321123232213112123   >>      C11112331312111112111133133313231333133313331321123232213112122   >>