Note: all of my questions and answers prior to 2019-10-01 were submitted on the understanding that I was licensing them under CC-BY-SA 3.0. I have never consciously licensed any of them under any other licence unless explicitly in the text of the question or answer. For the avoidance of doubt, you should consider yourself free to use them under that licence, and disregard any claims by third parties (including Stack Exchange) that they are available under other licences.
I have abandoned Stack Exchange due to losing confidence in the company to act reasonably. Look for me on Codidact.