it’s coming from this solubility rules trick: if you guys like it im good with it. dont really feel strongly about it. Kind of convoluted though so might need to write out what it means as it appears on the right of the image below.
Can’t say I have any strong feelings here. Mnemonics have their place, of course. This one is sort of neither superb nor awful. Doesn’t really leave me feeling anything on way or the other