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It belongs to the individual and to society

Involves:
A psychological phenomenon
A physiological process
A physical process

It is the product passively registered by an individual.

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Enables members of a society to use their language faculty. 

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Structure of a language
Social Product
Conventions adopted by society

It exists in the collectivity, for instance; "the shared rules governing a national language’s vocabulary, grammar, and sound system" (retrieved from: https://literariness.org/2020/10/11/langue-and-parole/).

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What the individual speaks
It involves:
Pronunciation
Use of words in society

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Sound pattern
' material ' element
Vehicle
psychological nature

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abstract
a concept
psychological nature

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Saussure, F. de, & Harris, R. (2016). Course in general linguistics. Bloomsbury.

Culler, J., & Saussure, F. de. (1990). Saussure. Fontana Press.