Occupying Free throw Spaces

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I am continually amazed at the misunderstandings over the lane. I had a newbie tell me last week that all the spaces had to be filled before the shooter could shoot. I told him that was not right. When he told me which of his partners told him that I was surprised. However, in retrospect, it was the same guy that I corrected one night by telling hiom it was not possible for the thrower to travel on a throw-in.