rosetn commented on a change in pull request #12953:
URL: https://github.com/apache/beam/pull/12953#discussion_r499071428



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File path: website/www/site/content/en/documentation/programming-guide.md
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@@ -3554,7 +3554,7 @@ Now, consider the same pipeline, but using a windowing 
function:
 
 **Figure 5:** `GroupByKey` and `ParDo` with windowing, on a bounded collection.
 
-As before, the pipeline creates a bounded `PCollection` of key/value pairs. We
+As before, the pipeline creates a bounded `PCollection` of file lines. We

Review comment:
       I'd replace "of file lines" with "by reading lines from a file using 
`TextIO`." I think how you have it earlier is clear.




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