C11112331312111112111133133313231333132313331333132233313221231   >>    C1111233131211111211113313331323133313231333133313223331322123   <<    C11112331312111112111133133313231333132313331333132233313221233   >>      C11112331312111112111133133313231333132313331333132233313221232   >>