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After the city leaves, whose share is the remaining infrastructure

In a city most people have moved out of, some residents who still want to live there remain. Maintaining infrastructure jointly means departed residents also share costs; handing it to those who stayed means it is unknown whether they can carry it. Among joint operation, handover, and living alternatives the stakeholder has agreed to, what promise should be carried on?

within 18 months for the infrastructure handover · Split 7:2:2