Re: I solved this when I was eight
Fair enough. I forgot those. I'm getting rusty. I'd argue that "down" etc. might be the more representative though. (tbh I have no evidence, just my own experience). Either way it's probably not the best way to define the sound. I assumed, incorrectly that you were defining the pronunciation with that sound "sc/ou/n)
English is like that.
It's one of the reasons why the government's emphasis on phonics teaching is so misdirected, even if you don't know much about human learning and how we actually read this demonstrates it.