C312312111111331312111133133313331333121111331333132313331333133313223313231231   >>    C31231211111133131211113313331333133312111133133313231333133313331322331323123   <<    C312312111111331312111133133313331333121111331333132313331333133313223313231233   >>      C312312111111331312111133133313331333121111331333132313331333133313223313231232   >>