If your thumbnail line and title say the same thing, rewrite one of them. Together they should form one promise told in two complementary parts, image-first and text-second.
Should the thumbnail text repeat the title?
No. The thumbnail and the title are your only two tools before the click, and repeating the same words in both wastes one of them. The thumbnail stops the eye; the title should add the information that converts the pause into a click.
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