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   <h1>PC Scheme</h1>
+  <p>PC Scheme (also spelled PC-Scheme, PC SCHEME, PC-SCHEME) is a
+  Scheme implementation for DOS operating systems from the early
+  1990s.</p>
+  <p>It originally ran on MS-DOS. Nowadays it also runs on FreeDOS
+  as well as emulators like Dosemu.</p>
   <p><a href="./">lang/scheme/impl/pcscheme/</a></p>
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     <li>
