Watch tutorials and explanations by expert teachers that walk through solving this problem.
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Variations on a theme
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![leetcode1003 Check If Word Is Valid After Substitutions [Chinese]](https://i.ytimg.com/vi/zQY_eMDw0sQ/hq720.jpg?sqp=-oaymwEXCNAFEJQDSFryq4qpAwkIARUAAIhCGAE=&rs=AOn4CLBeAHbYT9qco1-DD1WiU8HWSoBHpA)
