Hi, 

Filter runs are basically "independent" and "start over" with all tiddlers.

Filters produce an array of "titles", which is passed from 1 run to the 
next run, if it has a leading + symbol. Then the following run uses the 
output of the previous run. 

That's basically it. So filter runs don't have an "internal" memory. 

Filters themself can _not_ store internal info into variables. ... You'll 
need to use <$set name=abc filter="xx"> if you want to write a filter 
output to a variable and then in the "next / nested" filter use it with 
[<varName>]

-mario

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