Chain Selects - Replacing Placeholder with actual value

I have 5 drop downs in my chain. The first 2 do exactly what I want them to do.
However, when I make a selection from the 3rd, instead of showing the placeholder value, I want it to show the only other value in the drop down for #4 which will trigger the only other value in #5. Has anyone done this before?

This will save the user at least two clicks.

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