As a prerequisite for the Pahlava reforms you need to build both Reformed Pastoralism and Warlord's Horse Herds, but if you build Reformed Pastoralism first you can no longer build Warlord's Horse Herds, effectively painting you into a corner where your only option is to demolish Reformed Pastoralism, making you start back over at Migration and costing you a 10 (I guess) turns and thousands of mnai.
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