C312312111133131212111133133313231333133313331322121111331333132213311   >>    C31231211113313121211113313331323133313331333132212111133133313221331   <<    C312312111133131212111133133313231333133313331322121111331333132213313   >>      C312312111133131212111133133313231333133313331322121111331333132213312   >>