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This problem may come about anytime.

He said he had no idea how all these things may have come about in his company.

How did it come about that you were free at that time anyway?

How did this damage come about? This came about due to the windstorm.

How had this situation come about?/ He will need to figure out how they came about in the first place.

So how did the accident come about exactly?

How did the problem come about in the first place?