Buy some Anthrax, write a letter and send it to Kim Jong Un. Begin creating defense systems and prototype weapons, when NK attacks the US, sell weapons and DS to both North Korea and US, since both countries will have the same tech, they’ll keep coming to me to get more advanced tech. Infinite money loop.
[spoiler]May or may not work[/spoiler]
English
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I’ll have one of your best toasters And an envelope
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Sure thing. Anything else?