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[Simultaneously] engaging in unwise behavior, or poor decision making (a "knucklehead"), while being so self-assured and confident (headstrong) in your [information], data, choices, and actions that you are doomed to failure, that is, without the benefit of sheer dumb luck. [Successful] outcomes tend to lead to greater knuckleheadstrongness until unemployment, disaster, dismemberment, or death occurs.
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