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Here, we search through, and filter text from the Beatitudes, found in the book of Matthew (chapter 5).
This finds blocks of text that start with "Blessed are", followed by one or more words (denoted by the {who} pattern variable), and then followed by a colon.
When you click on the Filter button, all text other than the matching pattern is filtered out, so you are left with the list below.
Here we refine the filter so that only the {who} part is listed.
This filter returns the {who} and {what} part from the above pattern.
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