But one good reason is that "some" can be ordinarily used in some declarative senses in which "any" doesn't work. For example, compare:
"I see some of these numbers are odd."
and
"I see any of these numbers are odd."
And even if the second way was ordinary usage, it would seem to imply that all the numbers are odd.
Since "some" has this quality, you can mentally parse Arc statements using "some" into statements like the one above.
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