C11112331312111112111133132313331333133313233313133313231322121   >>    C1111233131211111211113313231333133313331323331313331323132212   <<    C11112331312111112111133132313331333133313233313133313231322123   >>      C11112331312111112111133132313331333133313233313133313231322122   >>