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OXF3000N 
lâu dài vĩnh cửu thường xuyên 
permanent
OXF3000N cách thường xuyên vĩnh cửu permanently
like: vĩnh cửu → →
the eternal struggle between good and evil ☊ evil ☊
These lands had been granted to the family in perpetuity. ☊ grant ☊