Hey all

I've got a situation where I have two lists. List A and List B. I've 
specified some dummy info below:

*A: *Alpha Beta Gamma Delta
*B **(this will change by user input, but for this example:) *Alpha Gamma

I want to write a filter to apply to List A where if any item does not also 
appear on List B (i.e. in this case Beta and Delta are missing), it is 
overwritten by the immediately subsequent value in List A, except the very 
last item in List A which is remains in place to act as a default value if 
no subsequent value can be found.

So in this example the filtered version of List A would output as: *Alpha 
Gamma Gamma Delta*, because Beta was not present in List B so it is 
replaced by the next value of Gamma, and Delta remains because it is at the 
very end.

My question is, is there a way to do this with a static filter expression? 
I'm sure I could make something with action-listops widgets that would do 
the job when they were activated, but ideally I want something that updates 
automatically whenever the user changes List B.

Any help anyone could provide would be much appreciated.

Thanks
Joseph

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