I'm writing my essay about corruption and I've come to a sentence into which I'd like to put an adverb, but I'm not sure about its place.
Corruption also can relate to unjustly gaining advantage over other people...
Should I place it before the verb and after to as in Split Infinitive?
...or should I choose the following sentence?
Corruption also can relate to gaining unjustly (?) advantage unjustly (?) over other people...
...or should I use the adjectival form of the adverb as here:
Corruption also can relate to gaining unjust advantage over other people...
Thanks in advance.