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Jack, thank you for your response. I read your document, and it contains a lot of useful information.
Regarding point 2, I don't quite understand what you mean by "function_1" and "function_2"... Are you referring to the names of the functions themselves? Or are these functions similar to `first_day`, but for checking other days?
Regarding point 3, I took part of the code from another map where everything works as it is, and that's how I initially tried to copy it into my map. But it doesn't work for me.
And regarding the last point, I don't quite understand what you mean.
I've already tried calling the function through a trigger when touching an object, but that didn't work either.
I don't know what else to do; in theory, it seems clear, but in practice, I feel like "a monkey with a grenade."