I was reinstalling Win95 and Win98 so much in my youth that, to this day, I still have my Windows 95 OEM number and Windows 98SE CDKEY memorised and can recall

I was reinstalling Win95 and Win98 so much in my youth that, to this day, I still have my Windows 95 OEM number and Windows 98SE CDKEY memorised and can recall them with no effort. 20 and 25 alphanumerics respectively. I didn't know about the much smaller 10-digit Win95 keys.