C1111233131211111211113313331333133313232212111133131211331123311   >>    C111123313121111121111331333133313331323221211113313121133112331   <<    C1111233131211111211113313331333133313232212111133131211331123313   >>      C1111233131211111211113313331333133313232212111133131211331123312   >>