In cases of duplicative causation, one can, obviously, say that at least one of the tortious causes was necessary for the injury — because everything has to have a cause — but that isn't how «necessary» is used in but - for. (slaw.ca)
Through a coordinated system, a community school offers more effective programs and services than any one of its partners could offer on its own and eliminates duplicative efforts. (cacommunityschools.org)
Arsenault explained, «The centralized Louisiana court will help us deliver justice to the teachers by streamlining the proceedings, eliminating duplicative efforts, and conserving resources so we can help teachers get the outcome they deserve.» (fairtest.org)