Operator is related to Mechanism. Mechanism can be used for Help. Help requires Volunteer. 
Tolerance is related to Limit. Limit is related to Upper. Upper is related to Advantage. 
Operator <--RelatedTo--> Mechanism --UsedFor--> Help --HasPrerequisite--> Volunteer 
Tolerance <--RelatedTo--> Limit <--RelatedTo--> Upper <--RelatedTo--> Advantage 