This is the 445th most frequent Serbian word.
сарадње
Cooperation.
Here, 'сарадње' is used in a genitive case to indicate the type of relationship present among the people mentioned, highlighting collective effort.
Међу нама постоји одличан ниво сарадње.
Among us, there exists an excellent level of cooperation.
In this sentence, 'сарадњу' is used in an accusative case, indicating the necessity and involvement of the addressee's cooperation for completing an action.
Пројекат можемо завршити само уз вашу сарадњу.
We can only complete the project with your cooperation.
The word 'сарадње' appears in a genitive case again, but this time specifying the goal to improve the existing cooperation between specific entities.