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https://thealbaanisite.com/2014/08/14/how-to-move-your-finger-in-tashahhud-you-move-it-up-and-down-a-lot-in-a-manner-that-can-hardly-be-seen/
How to Move Your Finger in Tashahhud—You Move it Up and Down a Lot in a Manner that Can Hardly Be Seen