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Updated: October 12, 2026
Here it needs only to be restated, that there are radical differences in social organization, government, house-building, and the like, between the Igorot-Ifugao groups, and the Ilocano-Tinguian-Apayao-Kalinga divisions. All the tribes of northwestern Luzon belong to the same linguistic stock which, in turn, is closely related to the other Philippine languages.