Hmm... I didn't know the farm had a population limit, but that would explain it. I have 28 villlagers at the moment. I think I lost track of the food supply because of training some villagers to become elders, so that was my fault. Can villagers live off stew? Because I'm pretty sure the food is going to run out pretty soon, and I don't like the idea of ousting any of them.
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When climbing the ladder of success, always remember. You can help as many people as you want- but in the end they'll get up there first and drop wet, sticky things on your head.