Just a guess, but - 1. Good-faith efforts at contribution where a person happens to be wrong? (happens to the most conscientious of us) 2. Instances where the

Just a guess, but - 1. Good-faith efforts at contribution where a person happens to be wrong? (happens to the most conscientious of us) 2. Instances where the speaker has made their confidence level explicitly known? ("Just a guess...", "I am not a lawyer, but...", "I'm not certain, but my understanding is that..." etc)