Direction is related to Rear. Rear is related to View. Viewer is derived from View. 
Touch is related to Use. Use is related to Hang. Hang is related to Wave. 
Direction <--RelatedTo--> Rear <--RelatedTo--> View <--DerivedFrom-- Viewer 
Touch <--RelatedTo--> Use <--RelatedTo--> Hang <--RelatedTo--> Wave 