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- Economics 29
- Aquifers 24
- Recycling 24
- Water reuse 23
- Demography 22
- Water consumption 22
- Negotiation 5
- International regimes 3
- Resource allocation 3
- Groundwater 2
- Hydrology 2
- Peace 2
- Saline water conversion 2
- Water diversion 2
- Armed Forces 1
- Bureaucracy 1
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- Imports 1
- Industries 1