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First you send me 5 keys as i send you contagion 4 pack, you open it and you send me the other 3 copies as i send you 4 keys back.
I do 1 key + 4 to get back for 1 copy
First you send me 5 keys as i send you contagion 4 pack, you open it and you send me the other 3 copies as i send you 4 keys back.