Hi, Put your hand in a vertical manner on the tabel Put your hand upright on the tab le . 'In a vertical manner' sounds odd. 'Upright' sounds better, but really, I am not sure of how you want me to put my hand on the table.
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Nader75put the finger on the string upright without declinationMaybe the word you're looking for is "perpendicular" (i.e. the finger has to be perpendicular to the string). Just a wild guess.