Refuse is related to Back. Back is related to Shoulder. Shoulder is related to Body. Immigration is a type of Body. 
Bull is related to Energy. Energy is related to Strong. Strong is a different concept from Week. 
Refuse <--RelatedTo--> Back <--RelatedTo--> Shoulder <--RelatedTo--> Body <--IsA-- Immigration 
Bull <--RelatedTo--> Energy <--RelatedTo--> Strong <--DistinctFrom--> Week 