41In those circumstances, in order to provide a useful answer to the referring court, it is necessary to take account of the existence, in the case in the main proceedings, of a divergence between, on one hand, the employment contracts at issue in those proceedings and the places of employment which they stipulate — on the basis of which Format requested an E 101 certificate to be issued — and, on the other, the way in which the obligations were performed in practice under those contracts.
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