Disability is related to Blind. Blind is a synonym of Screen. 
Concern is a synonym of Thing. Thing is related to Instructor. Instructor is related to Teacher. Teacher is related to Boss. 
Disability <--RelatedTo--> Blind <--Synonym--> Screen 
Concern <--Synonym--> Thing <--RelatedTo--> Instructor <--RelatedTo--> Teacher <--RelatedTo--> Boss 