101However, while such factors may be taken into account in the context of the balancing exercise referred to in paragraph 93 of the present judgment, the fact remains that it has not been established that the difficulties referred to by the Republic of Poland, which are not exceptional, are such as to rule out the possibility of having set shorter periods, especially since a large portion of the measures envisaged are connected with the replacement of individual and collective boilers by more efficient equipment.
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