Look at the split between duplicated F and duplication of F
How can we have duplicated F? Some how means to me as if we can clone a F and create a new one.
OTH, duplication of F considers possibility of similar construction of an existing F.
Between D & E, E clearly expresses the condition.
icandy thanks for the explanation but I am still not convinced.
What will the end product of "duplication of facilities" ?..Won't it be called "duplicated facilities".
Further the "if only because" part in E looks awkward.