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No TPTP formula. May not be expressible in strict first order. Geography.kif 4931-4931 Water current is a subclass of flow region
No TPTP formula. May not be expressible in strict first order. Geography.kif 4932-4932 Water current is a subclass of water area
No TPTP formula. May not be expressible in strict first order. Geography.kif 5039-5039 Littoral current is a subclass of water current


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