Multiple dropdown with one dependency? 

Here is a summary of last week's live one-hour design session (ru-vid.com.... Benoît & Ceara attempted to answer a question about using two simple dropdowns that let the user define one value. The question was shared by Gene Lee UX StackExchange.
00:07 What's this week's problem?
00:52 Problem Statement
2:23 Our Hypothesis
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