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In page Ferdinand de Saussure:

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While a student, Saussure published an important work about Proto-Indo-European, which explained unusual forms of word roots in terms of lost phonemes he called sonant coefficients. The Scandinavian scholar Hermann Möller suggested that they might be laryngeal consonants, leading to what is now known as the laryngeal theory. After Hittite texts were discovered and deciphered, Polish linguist Jerzy Kuryłowicz recognized that a Hittite consonant stood in the positions where Saussure had theorized a lost phoneme some 48 years earlier, confirming the theory. It has been argued[citation needed] that Saussure's work on this problem, systematizing the irregular word forms by hypothesizing then-unknown phonemes, stimulated his development of structuralism.