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<http://schema.org/valueRequired>
"true"^^<http://www.w3.org/2001/XMLSchema#boolean>
<https://www.koranika.ru/2020/10/15/81-%D0%B0%D1%8F-%D1%81%D1%83%D1%80%D0%B0-%D1%82%D0%B0%D0%BA%D0%B2%D0%B8%D1%80/>