44In this case, in so far as the action brought by Mrs Dunai is based on the term relating to exchange difference which was included initially in the loan contract concluded with the bank, it is for the referring court to ascertain whether the national legislation, which declared terms of that nature to be unfair, allowed the legal and factual situation in which Mrs Dunai would have been in the absence of such an unfair term to be restored, in particular by giving rise to a right to restitution of advantages wrongly obtained, to her detriment, by the seller or supplier on the basis of that unfair term (see, to that effect, judgment of 31 May 2018, Sziber, C‑483/16, EU:C:2018:367, paragraph 53).
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