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HQ9++ is an esoteric programming language designed by Cliff L. Biffle in 2001 as an extension of HQ9+. Like its predecessor, HQ9++, contains four commands: H, Q, 9 and +. The commands in this language are more interesting than useful for practical purposes and include:
- H: Print "Hello, World!"
- Q: Print the code's source code
- 9: Print the entire lyrics to "99 Bottles of Beer on the Wall"
- +: Increment the accumulator

In addition to these original commands, HQ9++ extends functionality with additional operations that can hold state information between runs.

When it comes down to it, HQ9++ is more of a fun and jokingly impractical exercise than a serious programming tool.

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