The TGML processing deleted some characters.
Here's a correct version:
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Join(["Jan", "Feb", "Mar", "Apr", "May",... "Dec"][Month({start_date})to Month({end_date})], ", "

;
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The internal stuff returns all the array elements betrween start and end month.
The join() function then turns the resulting array into a single string (comma separated).
Cheers,
- Ido
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