If it is the third set of RMB, have you noticed whether there are two RMB notes? No, don't buy a third set. It depends on which one. The value of a leaflet is more than 3000.
If the fourth set is a 90-edition set without an 80-edition set, don't buy it, because the market price of the fourth set of 80-edition 50 yuan is 4,000.
If you have both, congratulations on winning the lottery. It's worth about 20 thousand now
If you don't, you won't be angry. At least worth more than 6000.