21.   After a car crash, the police try to determine what exactly happened by examining the damaged vehicles, noting their locations and measuring skid marks.

22.   After we had bought this place and were cleaning it up, a local woman named Edith Quinn happened by.

23.   Almost anywhere, a mariachi band might happen by.

24.   All helped it happen by wearing down the Stars during a five-minute third-period surge.

25.   All this did not happen by accident.

26.   Both sides are eager to end the case and that could happen by the end of the week, sources said.

27.   But dual supervision does not always happen by accident.

28.   But he made it clear that if the slowdown did not occur naturally, the Fed would make it happen by hiking short-term interest rates.

29.   But just then a clerk happened by, so I asked him where to find it.

30.   But that had not happened by early June, when Iran announced the arrests over the state radio.