The basic structure of TiddlyWiki is XML, and it also feels because
everything is embedded in one another.
```
In the list of tiddlers
If tiddler meets a condition
List its tags
end
end
```
There are program flows that cannot be implemented in it, such as defining
a variable in one block, which is evaluated in another block.
```
In the list of tiddlers
If tiddler meets a condition
Add its tags to a list of tags
end
end
Filter out duplications from the list of tags
Show the list of tags
```
In principle, we could use fields of tiddlers to store variables, but we
can only modify them by direct user intervention (eg. `<$action-listops` by
pressing a button).
How do I implement the second example without user intervention?
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