(subclass NorthCentralBirdsHeadLanguage BirdsHeadLanguage) | Languages.kif 13671-13671 | |
(subclass CentralBirdsHeadLanguage NorthCentralBirdsHeadLanguage) | Languages.kif 13678-13678 | |
(subclass NorthBirdsHeadLanguage NorthCentralBirdsHeadLanguage) | Languages.kif 13707-13707 |