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DIY: Expressive Words

Explore the concept of stretchy words by implementing a function that counts how many words in a list can be extended to match a target string. Understand the rules of character group extension and apply string manipulation skills relevant to coding interview scenarios.

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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