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Source: https://trizway.com/art/book/triz-pedagogika.html#%D0%BE%D1%82%D0%BA%D0%BB%D0%B8%D0%BA%D0%B8-%D0%BD%D0%B0-%D0%BA%D0%BD%D0%B8%D0%B3%D1%83-%C2%AB%D1%82%D1%80%D0%B8%D0%B7-%D0%BF%D0%B5%D0%B4%D0%B0%D0%B3%D0%BE%D0%B3%D0%B8%D0%BA%D0%B0%C2%BB