78As regards the category of contractual terms which fall within the concept of ‘main subject matter of the contract’, the Court has held that those terms must be understood as being those that lay down the essential obligations of the contract, to the exclusion of terms which are ancillary to those that define the very essence of the contractual relationship (see, to that effect, judgment of 20 September 2017, Andriciuc and Others, C-186/16, EU:C:2017:703, paragraphs 35 and 36 and the case-law cited). In the present case, the main supplies are those listed in paragraph 21 of this judgment, the purpose of the withdrawal clause being rather to penalise the behaviour of a client who acts against the advice of his or her lawyer. That term does not therefore fall within that category.
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