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: word[:index] takes everything before the letter, and word[index + len(letter):] takes everything after it. Adding them together effectively "deletes" the unwanted part.

You can solve this using a while loop to repeatedly find and remove the target substring until it no longer exists in the word.

: If letter is an empty string, the loop would run forever; we return the original word immediately.

The prompt likely refers to from the CodeHS Python curriculum. This exercise requires you to write a function that removes every instance of a specific "letter" (or substring) from a given word. Correct Python Implementation