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Remove lines from a list that doesn't appear in another list

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@StructureEmma wrote:

Hello,
I am trying to use ‘cull pattern’, but I can’t find out what I am doing wrong… I have 2 lists of lines, and I want to keep all the lines in list 1 that are also in list 2. So every element of list 1 that isn’t in 2 need to be removed. So I used ‘equal’ but I only have 1 line over, instead of nearly all the lines… Is there another command I need to use for this? Thanks!

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