C1111233131211111211113313331333133313232321333133313331333212133211   >>    C111123313121111121111331333133313331323232133313331333133321213321   <<    C1111233131211111211113313331333133313232321333133313331333212133213   >>      C1111233131211111211113313331333133313232321333133313331333212133212   >>