Still don't get the gas one: if it's what I think (the only gas in the list that fits) can't see where the 1st letter comes from, either. Or what am I missing? Has the proverbial penny dropped for the others or not?
I'd rather struggle for the mo, chris. Can I assume that the first letter of 1d is one of the last 3 letters of the alphabet? Still doesn't help with the parsing though hah. Yes jaunty, (after the horse has bolted !)