46With respect to a standard term such as that at issue in the main proceedings which allows the supply undertaking to vary unilaterally the charge for the gas supply, it must be observed that it follows both from the second sentence of point 2(b) and point (d) of the annex to Directive 93/13 and from point (b) of annex A to Directive 2003/55 that the legislature recognised, in the context of contracts of indeterminate length such as contracts for the supply of gas, the existence of a legitimate interest of the supply undertaking in being able to alter the charge for its service.
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