I could swear I read about this somewhere but typically now I need it, I can't find it and the way some requests are worded, I just wanted to double check because if I've got it wrong, I'll need to edit my letter ;)

So, say I've requested Doritos and The Moss Covered Unicorn, can I in my letter state that I'm ok with receiving Doritos/Monster Munch even though Monster Munch is not a nominated character in the belief that Doritos is and will be the main focus/POV of the work or can I only have them shipped with chips that are nominated in the tagset?

And likewise, assuming that my recipient has stated they're cool with Doritos/Monster Munch or cool with Doritos/any chips, can I write Doritos/Monster Munch for them or in that case, if I wanted to pair Doritos up, would it have to be Doritos/Moss Covered Unicorn as Moss Covered Unicorn is also a nominated character?

(Translation: do I have to keep pairings exclusively between nominated characters or as long as the focus is on one of the nominated character(for extra treats)/the requested character(for matching), can I pair with non-nominated ones provided the recipient is ok with said pairing or at the very least has given a blanket pairing approval or at the very very very least it's not listed that they don't want it?)