Knowledge (savoir)
-  language specific
-general concepts (e.g. root, prefix, suffix)
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So, for a start, we have some knowledge on language, on how language works, on how language is used to convey meanings. This of course includes both specific knowledge for specific languages (the system of affixation which is used in English or in French) and general knowledge about languages (the concept of root, the concept of prefix, the concept of suffix).