OK, so the title sounds more like a cryptic crossword clue rather than something that explains my question, so please feel free to make it into something more sensible if you can (and remove this sentence)...
Let's say we have two items, the items do not matter but for this example let's say the first is "fish" and the second is "chips".
If I were serving these items I might ask one of the following questions:
"Would you like fish or chips?" - implying that they could only choose one or the other.
"Would you like fish and chips?" - implying that they could only have both items together.
Now the question: Is there a word (or two) that could replace and/or in the above sentences that would imply that they can choose to have fish only, both fish and chips, or neither of them, but not chips only?
To try and clarify my requirements, here is the original example that inspired me to seek out an answer...
Originally I read the following sentence on StackOverflow (a different SE site for those that don't know):