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I will assume the HTML as the state of the app and no other state representations (although it applies the same logic)

• we have an event that triggers the check
• we have an identifier for all select options
• we take the value of the first one and compare it with the second one and so on
• if the value is the same in all cases it's invalid

that's basically the algorithm. we can optimize it by early exits.

But maybe I missunderstood something.