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tr++
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Tr++ is an extension of tr developed by User:Klk bb that adds a couple of commands.
Commands
In addition to the "2" command from the original tr, tr++ adds:
3 outputs "4" (XKCD Random Number).
4 is the opposite of the "3" command and outputs "3".
Examples
Hello, world!
2
XKCD Random Number
3
Quine
tiro
Interpreter
Python
print({'2':'hello, world','3':'4','4':'3'}.get(input(),'tiro'))