In this task, you're given an input that contains two words, and your task is to predict the correct preposition that connects these two words. Predict the preposition that explicitly conveys both words' meaning, e.g., Word1: king 
 Word2: fort: "king of fort". Possible prepositions are: "of", "on", "in", "for", "from", "about", and "with".

Q: Word1: tangle 
 Word2: branches

A: of
****
Q: Word1: protest 
 Word2: street

A: at
****
Q: Word1: systems 
 Word2: treatment

A:
for
****