Sir Krenshton
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Comrade Jack_of_Shadows seems to have explained everything very clearly. What else can I clarify for you if there's a comment for each line? The way the question is phrased is also strange: "Explain what those letters are." Either write what specifically is unclear in the code, or it will seem like you don't understand Russian.
I apologize, but I don't know what a Lua Code Sample is and where to modify it. I've searched online, but I still don't understand. If you know, please answer: 3