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I once went to a group lesson with Jon Gomm and John Wheatcroft, and they said that you should do this. If you want to learn a phrase from a song you should play it once, add in a pause of a bar while you take your hand away from the neck, play the phrase again and repeat. They said you should do this because when you play the song for real you won't be repeating it over and over you'll be playing it once, and it helps you learn it better.