Arm is related to Bone. Bone is related to Internal. Internal is the opposite of External. 
Birthday is the opposite of Death. Death is related to Liberty. Liberty is related to Freedom. 
Arm <--RelatedTo--> Bone <--RelatedTo--> Internal <--Antonym--> External 
Birthday <--Antonym--> Death <--RelatedTo--> Liberty <--RelatedTo--> Freedom 