Is "when" necessary here?
While technically "when" is not necessary here, the speaker has used it to signify a hypothetical situation or subjunctive mood will follow. Thus, it is better to use it in this situation as it is a good clue for understanding and predicting the rest of the sentence. Ex: What if when you go to work, you get into an argument with a coworker. How should you react? Ex: When you check your email, you should answer emails in order of priority.
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