Numbering omnibus edition?
I have a series of 5 books, the first three of which are in an omnibus edition and the last two of which are singletons. I'd ideally like to series number them as 1-3, 4, 5 but can't; numbering them 1, 2, 3 makes it look like 4 & 5 are missing; 1, 4, 5 makes it look like 2 & 3 are missing. Short of spitting the omnibus edition, can anyone suggest a good way to deal with this?
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