ABC is an actively used programming language created in 1980.

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Example code from the Hello World Collection:

\ Hello world in ABC

WRITE "Hello, World!" /

Example code from Wikipedia:

HOW TO RETURN words document:
   PUT {} IN collection
   FOR line IN document:
      FOR word IN split line:
         IF word not.in collection:
            INSERT word IN collection
   RETURN collection
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Last updated February 11th, 2019