Assertion: nobility's family | /r/CapableOf | form tight-knit hereditary caste
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Source sentences:
text: Unlike in the case of their ethnic Polish counterparts, the western Ukrainian nobility as a class played a marginal role in western Ukrainian society, which came to be dominated by Ukrainian priestly families, who formed a tight-knit hereditary caste that constituted the wealthiest and most highly educated group within the Ukrainian population.