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The sentence is found on line C, where it says...
But, you may choose to enter “-0-” if you are married and have either a working spouse or more than one job.
Is that correct? And why? Seems rather odd that the government would make such a mistake, no?
Edit - I'm not asking if it's correct or not to put a comma after a conjunction. I'm asking if it's OK to use "But" as a substitute for "However." I'm also not asking if it's "always necessary" to put a comma after conjunctive adverbs like "however." I'm saying this because it's the government that wrote it, and the government, I'd think, would be right in doing so. I just wanted to know if it's "generally" acceptable to do that or if it's an actual mistake.