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"A fundamental requirement for any measures derogating from the Covenant, as set forth in article 4, paragraph 1, is that such measures are limited to the extent strictly required by the exigencies of the situation. This requirement relates to the duration, geographical coverage and material scope of the state of emergency and any measures of derogation resorted to because of the emergency… Nevertheless, the obligation to limit any derogations to those strictly required by the exigencies of the situation reflects the principle of proportionality which is common to derogation and limitation powers. Moreover, the mere fact that a permissible derogation from a specific provision may, of itself, be justified by the exigencies of the situation does not obviate the requirement that specific measures taken pursuant to the derogation must also be shown to be required by the exigencies of the situation."
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