Some used books might have a CD or a link+password for online programs. The only problem is that some of those programs have a time limit and expire after a certain period of time. So like maybe the person before you used the program and it expired a while ago.
Check with the prof or the person who's selling the book (like tell them that you wanna try it out and see if the program still works).
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Education is the most powerful weapon which you can use to change the world.
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