fix typo in 4.2.5 (#1365)

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Peter Ganong 2023-03-13 16:32:37 -05:00 committed by GitHub
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@ -225,7 +225,7 @@ flights |>
### Exercises
1. In a singe pipeline, find all flights that meet all of the following conditions:
1. In a single pipeline, find all flights that meet all of the following conditions:
- Had an arrival delay of two or more hours
- Flew to Houston (`IAH` or `HOU`)