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Use "clannishness" in a sentence
"Their so-called clannishness, their solidarity, has many exceptions."
"Family ties superimposed on clan clannishness, which is the blood heritage of the Highland Scotch, made it impossible for him to feel otherwise."
"The latter are chiefly an expression of the predatory impulse simply; the former are more specifically an expression of that heritage of clannishness which is so large a feature in the temperament of the predatory barbarian."