Smooth entails/necessarily involves Rub. Sidewalk can be Smooth. 
Item is related to Bone. Bone is related to Composition. Composition is related to Peer. Peer is related to Social. 
Rub <--Entails-- Smooth <--HasProperty-- Sidewalk 
Item <--RelatedTo--> Bone <--RelatedTo--> Composition <--RelatedTo--> Peer <--RelatedTo--> Social 