I'd use with for 2a (involved with) in for 2b (implicated in) --------- concerned 2 a : interestedly engaged : INVOLVED <a business enterprise in which three men were concerned > <too many people are concerned with the bare mechanics of life> < concerned with books and music> b : culpably involved : IMPLICATED <intrigues that important men were concerned in> <everyone concerned in the bribery case has been identified> -------------
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