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Via: starwars.wikia.com
After Luke went to the Tosche Station, he had to excuse himself to his uncle Owen in a recognizable way: “But I was going into Tosche Station to pick up some power converters!” Actually, there was initially a scene in A New Hope in which this dialog’s background appeared. Luke was indeed “wasting time with his friends” like Owen accused him. Biggs Darklighter announced that he would soon run away and join the fight of the Rebellion, which could have acted as a stimulus for Luke to do the same.
