Cross is related to Sign. Sign is related to Outdoor. 
Violence can be used for Terrorism. Terrorism requires Hate. Hate would make you want to Kill. Kill is a type of Single. 
Cross <--RelatedTo--> Sign <--RelatedTo--> Outdoor 
Violence --UsedFor--> Terrorism --HasPrerequisite--> Hate --CausesDesire--> Kill --IsA--> Single 