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DIY: Expressive words

Understand how to determine if words can be stretched to match a target string by extending character groups. Explore the expressive words problem to sharpen your problem-solving and coding interview skills.

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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