Troubled is related to Concerned. Concerned is a synonym of Anxious. Anxious is a synonym of Nervous. 
Wedding is related to Big. Big is related to Steak. Steak is related to Bone. Bone is related to System. 
Troubled <--RelatedTo--> Concerned <--Synonym--> Anxious <--Synonym--> Nervous 
Wedding <--RelatedTo--> Big <--RelatedTo--> Steak <--RelatedTo--> Bone <--RelatedTo--> System 