Bone is related to Rib. Rib is related to Food. Food is related to Menu. 
Bone is related to Flash. Flash is a type of Cover. Mask is a type of Cover. 
Bone <--RelatedTo--> Rib <--RelatedTo--> Food <--RelatedTo--> Menu 
Bone <--RelatedTo--> Flash --IsA--> Cover <--IsA-- Mask 