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Early in the 20th century , Ferdinand de Saussure introduced the idea of language as a static system of interconnected units , defined through the oppositions between them .
 person: Ferdinand de Saussure
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
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Text: {0} 
Answer:
 person: Ferdinand de Saussure