50It follows that, as already noted in paragraph 46 above, the transparency requirement of contractual terms, as resulting from Article 4(2) and Article 5 of Directive 93/13, cannot be reduced merely to their being formally and grammatically intelligible. As the system of protection introduced by that directive is based on the idea that consumers are in a position of weakness vis-à-vis sellers or suppliers, in particular as regards their level of knowledge, that requirement, laid down by the directive, that the contractual terms are to be drafted in plain, intelligible language and, accordingly, that they be transparent must be understood in a broad sense (see, to that effect, judgments of 30 April 2014, Kásler and Káslerné Rábai, C‑26/13, EU:C:2014:282, paragraphs 71 and 72, and of 20 September 2017, Andriciuc and Others, C‑186/16, EU:C:2017:703, paragraph 44).
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