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Revan says that it's possible to build more than one building at a time. But I'm not sure if that would be wise right now. We only have 30 gold, and we don't know how much we'll get for the quest. Our monthly expenses are already 10 gold. Building an outpost and a tavern will cost us 9 gold immediately and increase our monthly expenses to 13 gold. We'll be left with less than a third of our funds. So, I suggest building only one thing. I think it's better to start with an outpost or a hospital (although it's quite expensive).
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Do you have three potions per month, Ment?