C1111233131211111211113313331333133313332213113121111331313331323132212121   >>    C111123313121111121111331333133313331333221311312111133131333132313221212   <<    C1111233131211111211113313331333133313332213113121111331313331323132212123   >>      C1111233131211111211113313331333133313332213113121111331313331323132212122   >>