0Would you say:02br 02br 01font00I like 01font00option02font00 a, c, and f 00or00 I like 01font00options02font00 a, c, and f.02font02br 02br 01font00....was significant on 01font00chromosomes02font00 6p, 10p, 13q, 15q, 18p, and 22q 00or00 ...was significant on 01font00chromosome02font00 6p, 10p, 13q, 15q, 18p, and 22q.02font02br 02br 01font02font02br 02br 00-Andrew0-
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05002br 02br 00Best wishes, Clive010id1
— Clive
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0Hi,02br 02br 01font00I like 01font00option02font00 a, c, and f 00or00 I like 01font00options02font00 a, c, and f.02font02br 02br 01font00....was significant on 01font00
0Thanks, Clive.02br 02br 00In this case, the context is somewhat irrelevant-01del00the item that I'm directly concerned with is a parenthetical that lacks a prepositional phrase02del00-I've wondered about this issue for awhile, so I made up those examples.02br 02br 00-Andrew0-
0 Hi Andrew,02br 00yes, as Clive says, I think the plural is the best choice. My books often say "Chapters 3 and 4", not "Chapter 3 and 4".02br 00It is interesting to notice that although you should say "Chapters 3 and 4", you should say "A black and a white cat" and not "A black and a white cats". 050010id1