People often ask for practice projects to get started with Common Lisp: "I just can't think of any way to use it!" One possible answer: if you run into a practical problem in your life, write a Common Lisp program to solve it. Here's a program I wrote to fight spam. It's not fancy, or innovative, or anything like that, but it's a short, easy project, the kind of thing for which I use CL all the time.
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