C1111233131211111211113313331333133313232321333133313331333212133211111   >>    C111123313121111121111331333133313331323232133313331333133321213321111   <<    C1111233131211111211113313331333133313232321333133313331333212133211113   >>      C1111233131211111211113313331333133313232321333133313331333212133211112   >>