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`at_left` version of an `at_right` lemma #2577

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Run time

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Job	Run time
coq	38s
mathcomp-bigenough	37s
coq-elpi	39s
mathcomp-finmap	37s
hierarchy-builder	0s
mathcomp	0s
mathcomp-analysis-single	0s
mathcomp-analysis	0s
	2m 31s