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Thank you, Eun! So my solution was to write SetDirectory[NotebookDirectory[]] Assuming that the files are in the same folder (directory) as the notebook itself. It all works nicely.
Awesome, thank you very much. Really solved the question! And so quickly! It is already on paper and on Evernote. It is always important in reference books to insert synonymous words, not only expert phrasing. After all, looking for information...