logic

if country A and country D are friends 

and country B and country C are friends 

and country A and country D 

are enemies against country B and country C

then if individuals from countries A and D 

work with or against each other 

to solve some problems 

then that will be less efficient 

but if individuals from countries A and B 

work with or against each other 

to solve some problems 

then that will be more efficient