Topic on Forum:Trope Talk
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Most of what's listed on the current Power trio page has nothing to do with Freud:Blonde, Brunette, Redhead ; Knight, Knave, and Squire ; Land, Sea, Sky ...
Perhaps we should rename the current "Power Trio" to "Trio" (optionally making it a subtrope of "Rule of Three"), then rename the current "Rock Trio" to "Power Trio".