question: What occurred at the treaty of Verdun ?
answer: Oaths of Strasbourg of 842 , was formally dissolved in 843
turker_answer: At the treaty of Verdun , Oaths of Strasbourg of 842 was formally dissolved in 843 .
rule-based: Oaths of Strasbourg of 842 , was formally dissolved in 843 occurred at the treaty of Verdun .