In prepositional clauses of purpose (ADV Fin) a whole range of primary and secondary prepositions are used. The most frequently used are pro+Acc, na+Acc and k+D.
Besides other cases, the preposition pro+Acc is used to express a destiny, na+Acc is used with deverbatives as well as with a wide range of nouns in general, k+D comprises nouns expressing a mental activity. Many examples arise from language usage, foreigners find them difficult to learn.