C11112331312111112111133132313331333133313233313331322132212121   >>    C1111233131211111211113313231333133313331323331333132213221212   <<    C11112331312111112111133132313331333133313233313331322132212123   >>      C11112331312111112111133132313331333133313233313331322132212122   >>