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Type the name of the language to interpret in the text field at the top. Available languages include:
You can use features of multiple languages by combining their names, or remove features by removing their parts of the name. For more information, see the wiki.
Write your program in the "Program" field at the left. If relevant, write input text in the "Input" field at the top right. Click or press Ctrl+Enter to run the program.
Infinite loops will cause the page to hang, so don't write them unless you want that.