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What does "but" mean here? Unusual syntactic use of the word “but”

What does "but" mean here?

If we are able to identify two things (a, b) or two occurrences of a thing, there must be some difference between them, otherwise it would make no sense to say that there are two things, or two occurrences of a thing, but one thing.

Source: On What it Means to ‘Be’ (philosophy blog)

I understand it's saying that we should say there's one thing instead of saying two things or two occurrences of a thing, but the inclusion of but in this sentence seems ungrammatical.

What does "but" mean here?

If we are able to identify two things (a, b) or two occurrences of a thing, there must be some difference between them, otherwise it would make no sense to say that there are two things, or two occurrences of a thing, but one thing.

I understand it's saying that we should say there's one thing instead of saying two things or two occurrences of a thing, but the inclusion of but in this sentence seems ungrammatical.

Unusual syntactic use of the word “but”

What does "but" mean here?

If we are able to identify two things (a, b) or two occurrences of a thing, there must be some difference between them, otherwise it would make no sense to say that there are two things, or two occurrences of a thing, but one thing.

Source: On What it Means to ‘Be’ (philosophy blog)

I understand it's saying that we should say there's one thing instead of saying two things or two occurrences of a thing, but the inclusion of but in this sentence seems ungrammatical.

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source | link

What does "but" mean here?

If we are able to identify two things (a, b) or two occurrences of a thing, there must be some difference between them, otherwise it would make no sense to say that there are two things, or two occurrences of a thing, but one thing.

I understand it's saying that we should say there's one thing instead of saying two things or two occurrences of a thing, but the inclusion of but in this sentence seems ungrammatical.