I need to say (in passive voice) that a certain set of objects was cleaned from (pruned of/pruned from?) certain subsets of undesirable objects. I know that prune away [undesired objects] is one of the proper forms. It is, however, not totally clear if from or of is better after prune.
Example: I have a set A that I start with. I then identify a subset B of it, which has to be removed for some reason. Then I say "Set A was pruned from/of set B".
Right now I'm using prune from, but want to decrease my uncertainty and hesitation.