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DIY: Expressive words

Explore how to identify and count stretchy words in a string by extending groups of identical characters based on specific rules. This lesson helps you implement the expressive_words function to solve real-world coding interview problems involving string manipulation techniques.

Problem statement

Given a string, S, and a list of words, return the number of words that are stretchy.

A word in words is stretchy with respect to S if S can be derived by extending the letters of the word. Here is the extend rule:

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