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Plurality of languages: [...] It is crucial 1. that there are many languages and that they differ not only in vocabulary, but also in grammar, and so in mode of thought and 2. that all languages are learnable.
Plurality of languages: [...] It is crucial 1. that there are many languages and that they differ not only in vocabulary, but also in grammar, and so in mode of thought and 2. that all languages are learnable.