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I'd create the ship in orbit here first, with a greenhouse that can grow food. Once it had been shown to be capible of growing enough food for 10 people on a sustainable basis, then I'd send it off toward mars. Then, when you get there, you have a greenhouse that can operate in Mars orbit, or it can be sent down to the surface. For that matter, food could be grown and sent to the surface for a year or two until the colonists on the planet are able to be self sustained.
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