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In this case the BIA held that persons forming a particular social group must share common immutable and/or fundamental traits such as sex, color, kinship ties, or shared past experience such as former military leadership or land ownership. 19 I&N Dec. 211, 233 (BIA 1985). Applying this reasoning, the BIA concluded that members of taxi collective did not share either immutable or fundamental traits and thus did not form a particular social group.