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ㅋㅋ
ㅋㅋ is the constant language ConstantLanguage("ㅋㅋ"). You can code anything you would like, but the language will neither compile nor process it. This unfortunately means that ㅋㅋ. is not Turing-complete. You could still create a quine and a cat program[see discussion], and infinite number of self interpreters.
Examples
Self-interpreted
ㅋㅋ
In a QuineAvaoiding("Kek",_"There is currently no text in this page. You can search for this page title in other pages, search the related logs, or create this page.") type of language:
kek
With autocapitalization systems when at the beginning of a statement.
Kek