(subclass LowlandArea LandForm) | Geography.kif 3984-3984 | LowlandArea は LandForm の subclass では %n |
(subclass Plain LowlandArea) | Geography.kif 4218-4218 | Plain は LowlandArea の subclass では %n |
(subclass Valley LowlandArea) | Geography.kif 4227-4227 | Valley は LowlandArea の subclass では %n |